Elements

Topic Page

Questions

• What periodic table elements are radioactive?
• How can the periodic table be used to predict the properties of the elements?
• How can elements have different isotopes?
• How can elements be broken down?
• How can elements properties be predicted?
• What is a chemical element?
• What element in the fourth period of the periodic table has 5 valence electrons?
• How are chemical elements diffrent from chemical compounds?
• What does organic chemistry study?
• How do elements change from left to right in the periodic tabale?
• What chemical elements are considered primary elements?
• Which family of elements contains metals, nonmetals and metalloids?
• Why do different elements make different color flames when you burn them?
• Question #3540d
• Question #1847d
• Question #18965
• Question #aec3a
• Question #7e1c8
• Question #195a0
• Question #1514c
• Question #77df1
• Question #f5b25
• Question #3db59
• Question #6e2b4
• Question #09fa1
• Which is molecular: xenon; argon; barium; iodine; potassium?
• Question #7cf45
• Question #a4223
• Question #dd483
• Is silicon (Si) a metal, metalloid, or non-metal? Explain.
• Elements are pure substances made up of only one kind of what?
• What is the difference between a coefficient and a subscript?
• Question #418af
• What is the origin of the term 'elements'?
• What is the chemical symbol for the element neptunium?
• How is mercury different from other metallic elements?
• What is nickel most used for in the U.S.?
• Question #87e4a
• Question #02449
• Is mercury a heavier element than tin?
• Question #36a13
• Can you account for the Periodic Table given electronic structure?
• Why are most materials compounds rather than elements?
• What element has 47 protons in its nucleus?
• What elements would have similar properties to Sulfur?
• Question #0aef7
• Question #a4bfb
• Which tells us more about an element's properties, its row or its column? Why is this?
• What is the correct symbol for the atom with 42 protons and 49 neutrons?
• How is the element Magnesium made or acquired?
• Question #7221f
• How many different elements are found in #H_2SO_4 + 2KOH -> K_2SO_4 + 2H_2O#?
• Question #53543
• Question #10bdd
• About how many elements form all substances?
• What are some positive ways arsenic is used?
• If we have an atom for which #Z=17# that possesses #"16 electrons"#, how would we represent it symbolically?
• What are properties of silver that make it easy to work with?
• Copper has a specific gravity of 8.9: what does this mean?
• What are two ways that elements can be made?
• Compare the reactivities of sulfur and calcium?
• What are the elements in the second third, fourth, and fifth periods that have the same number of highest-energy-level electrons as bariu.?
• Is fluorine more reactive or less reactive than chlorine?
• What are three forms of the element carbon?
• Question #3d849
• What is the element whose sulfide is known as #"stibnite"#?
• Question #fe61d
• Diamonds and graphite are two forms of what nonmetal?
• What is a flame test used for?
• Question #0fe12
• Why are neither the alkali metals nor the alkaline-earth metals found uncombined in nature?
• What are the six most abundant elements in seawater?
• In what two ways can elements occur in nature?
• Which region of the electromagnetic spectrum is involved in mass spectroscopy ? a. visible. b. radiowave c. microwave d. none of these
• Question #875ac
• Who discovered phosphorus?
• Why is diamond classified as an allotrope of carbon?
• Which element on the periodic table has a total of 16 protons?
• What properties of carbon explain carbon's ability to form many different macromolecules?
• What are f block elements?
• How can you learn f block elements?
• How many f block elements are there?
• What are f block elements known as?
• What are the f block elements in period 7 known as?
• What are the f-block elements in period 6 known as?
• Why are f block elements placed separately?
• Why are transition metals called D-block elements?
• Why is scandium outer electron configuration #4s^2 3d^1# and not just #3d^3#?
• How do you figure out the charge of an element that is located in the d-block of the periodic table?
• Why are d and f block elements called transition elements?
• What groups of elements does the d-block contain?
• Why is Fluorine more reactive than Argon?
• Which element has 47 electrons?
• What family of elements are the most reactive metals?
• Question #ea213
• How are nickel, calcium, magnesium, and antimony classified?
• In which block of the periodic table is chromium found?
• What is a transition metal?
• What are transitional elements in chemistry?
• What are the representative elements, transition elements and inner transition elements?
• How would you classify the following elements as main group elements, transition metals, or inner transition metals: 1.Ca 2.Fe 3.Ag 4.U 5.O 6.Pb?
• Which one of the following elements is a transition element? Why?
• What subshell is partially filled in the transition metals?
• Transition elements, such as chromium, are likely to have what type of oxidation number?
• Which of the following elements are transition metals: Cu, Sr, Cd, Au, Al, Ge, Co? How can this be determined?
• Why do transition elements exhibit such a variety of coloured compounds, complexes and different oxidation states?
• What are transition elements?
• What type of ions are formed by transition elements?
• What is the charge (positive or negative) of transition metals?
• How are transition elements used?
• How do transition elements form coloured compounds?
• How do transition elements form coordination compounds?
• How do transition elements form ions?
• How many inner transition elements are there?
• How many transition elements are there?
• What category of elements does krypton gas belong to?
• Which element was first discovered in space before it was discovered on Earth?
• How do you find metalloids on the periodic table?
• What are the six metalloids on the periodic table?
• What are three metalloids on the periodic table?
• What are two metalloids on the periodic table?
• Why are metalloids located on the periodic table?
• How can a flame test identify an unknown element?
• Question #16971
• Why is it that d-block metals occupy the #d# orbitals a lot of the time, whereas f-block metals occupy the #d# orbitals much less often? Can electronic transitions occur within the valence space of f-block elements?
• What is the abbreviation of Lanthanide?
• Question #05cb7
• What shows an element's number of protons in its nucleus?
• Which mineral is necessary for proper synthesis and function of the hormone thyroxine?
• What do the elements lithium, sodium, and potassium have in common?
• Are more than three-fourths of the elements in the periodic table nonmetals?
• How can the number of atoms of an individual element be determined by usung a chemical formula?
• What is the smallest particle of an element that retains the properties of that element?
• Question #1eae8
• What is the dominant form of breakage for sulfur?
• How many core electrons are in a ground state atom of arsenic?
• How does a lithium cation compare to a lithium atom?
• A chemical element is a pure substance that consists of only one type of what?
• What is a pure substance that consists entirely of one type of atom?
• An element has three naturally occurring isotopes with the following masses and abundances. How do you calculate the atomic mass of this element? What is the identity of the element?
• Does Hydrogen fuel require vast amounts of electricity?
• How many protons, neutrons, and electrons does a neutral hydrogen atom have?
• Why is phosphorus necessary for life?
• What is carbon used to form?
• What element can be represented by 45 #n^o#, 34 #p^+#, 34 #e^.#?
• How many protons, neutrons, electrons, energy levels and valence electrons does Boron (B) have?
• Sulfur is a common starting material for the Contact process. What is a source of sulfur?
• If an element has 14 electrons how many protons are present in the atom?
• What is made of two or different elements chemically combined ?
• Because of the arrangement of carbon's electrons it tends to form long what?
• Question #de296
• What is the oxidation state of a free element? Of a monoatomic ion?
• A new penny has a mass of 2.49 g and a volume of 0.349 #cm^3#. Is the penny made of pure copper? Wy or why not?
• What is the element with symbol As?
• What element has the symbol Kr?
• What is the element with symbol Al?
• What element has the symbol Ni?
• What is the element with symbol Ar?
• What is the element with symbol Ge?
• What is the element with symbol Bi?
• What is the element with symbol Xe?
• What is the element with symbol N?
• What element has the symbol Ag?
• What element has the symbol Rn?
• What is the element with symbol Na?
• What is the element with symbol Au?
• What are elements, compounds, and mixtures?
• From the first 20 elements, can you name an element made up of diatomic molecules with a single bond between the atoms?
• Why is the smallest unit that retains the properties of an element?
• What are the most abundant elements in the body?
• Approximately how many elements occur naturally on earth?
• What is associated with hydrogen?
• Why does oxygen (O) not have a subscript/number?
• What elements make up water?
• What are all alike in the same element?
• What element is used in thermometers?
• Sodium chloride is a compound of sodium and chlorine, which of these elements is the alkali metal and which halogen?
• There are 92 of what type of elements?
• What element is used in some balloons?
• What is an element used to make soft-drink cans?
• What do the four elements most abundant in life- carbon, oxygen, hydrogen, and nitrogen- have in common?
• What properties of carbon explain carbon's ability to form different large and complex structures?
• What the symbol for an element that is a halogen?
• What the symbol for an element that is an alkali metal?
• What the symbol for an element that is a noble gas?
• What the symbol for an element that is an alkaline earth metal?
• Why are Carbon atoms the most versatile molecular building blocks used by living organisms?
• Certain elements have special affinities for other elements. This causes them to bind together in special ways to form what?
• What should you do with a worn-out Li-on battery?
• What is the physical state of neon at room temperature?
• What is the physical state of oxygen at room temperature?
• What is the physical state of mercury at room temperature?
• Which element is most chemically similar to the element indicated by the letter E in the following periodic table?
• Which four elements are the primary components of important biological molecules, such as proteins, fats and carbohydrates?
• No other element can form the amount and variety of molecules that carbon can form. What characteristics does carbon have that explain this characteristic?
• What type of atom is sodium?
• What type of atom is neon?
• What type of atom is oxygen?
• What type of atom is phosphate?
• What type of atom is magnesium?
• What type of atom is nickel?
• What three elements are needed to start a fire?
• What element is found in amino acid that isnt found in simple sugors like glucose or fructose?
• How many more protons does sodium have than oxygen?
• If we are converting phosphorus from 3.44 moles to atoms, why do we sometimes do mole -> atoms? Instead of doing moles -> molecules -> atoms?
• What is the smallest particle of an element that can exist called?
• What is Sodium's number of protons?
• What is Flourines number of protons?
• What element has symbol of F?
• What element has symbol of N?
• What element has symbol of O?
• What element has symbol of Am?
• What element has symbol of Ar?
• What element has symbol of Na?
• What element has symbol of Cl?
• What element has symbol of Zn?
• What element has symbol of Cd?
• What element has symbol of K?
• What element has symbol of Li?
• What element has symbol of Rg?
• What element has symbol of Al?
• What element has symbol of C?
• What element has symbol of B?
• How did Lavoisier help to transform chemistry?
• Question #058cb
• Where did the noble gases get their name?
• What do protons determine about an element?
• How can pure oxygen be obtained from air?
• What are elements?
• What are the elements?
• What are elements composed of?
• How many elements are on Earth?
• How are elements formed?
• What is one property of copper?
• What is one property of nitrogen?
• What is one property of oxygen?
• What is one property of phosphorous?
• What is one property of silver?
• What is one property of chlorine?
• What is one property of sodium?
• What determines how reactive an element is?
• What is one property of neon?
• What is one property of helium?
• What is one property of aluminum?
• What is one property of tungsten?
• What types of elements make up nucleic acids?
• There are about 115 elements, each of which has its own chemical what?
• Phytoplankton are said to release how much of the oxygen in Earth's atmosphere?
• What is the full name of this element?
• What are the main sources of nitrogen oxides in the atmosphere?
• How do you name and classify Kr and Xe?
• An unknown element is shiny and is found to be a good conductor of electricity. What other properties would you predict for it?
• Question #142a1
• What is a third period dianion?
• Living organisms are composed of millions of organic compounds, each having a unique structure. What element is responsible for this huge diversity of molecules?
• Are oxygen atoms different from the atoms of other elements?
• What are 5 elements named after countries?
• What are 5 elements named after people?
• What is the number of neutrons in #""_(5)^(10) "B"#?
• What do halogens include?
• What is one element in the which is a gas at room temperature and in which the atoms are joined together in molecules?
• What are the Group 3 elements called?
• What are the Group 6 elements called?
• What does Element mean?
• An atom of calcium has 20 protons, how many electrons does it have?
• What elements are least abundant in the universe?
• What do all atoms of all elements have in common?
• Question #a895e
• What is the symbol of the element in Group 4 and Period 2?
• What is the symbol of the element in Group 4A(14) and Period 2?
• Which two gases make up 99 percent of the gases in the atmosphere Which gas is more abundant?
• Can atoms of the same element differ in the number?
• What one element from an distinguishes other?
• What are the simplest pure substances that cannot be broken down chemically into other substances?
• How do you find the number of electrons in an element?
• Evaluate the physical properties of potassium, magnesium, and copper. Select the best choice to use for a building project. Why is this metal the best building material to use?
• What are all the halogens?
• What are two elements that would have properties similar to beryllium?
• What are two elements that would have properties similar to silver?
• What are two elements that would have properties similar to gold?
• What are two elements that would have properties similar to nickel?
• What are two elements that would have properties similar to iron?
• What are two elements that would have properties similar to argon?
• What are two elements that would have properties similar to xenon?
• What are two elements that would have properties similar to tungsten?
• What are two elements that would have properties similar to copper?
• What are two elements that would have properties similar to sodium?
• What are two elements that would have properties similar to oxygen?
• What are two elements that would have properties similar to neon?
• What are two elements that would have properties similar to sulfer?
• Is Magnesium a solid, liquid, or gas at room temperature?
• Is neon a solid, liquid, or gas at room temperature?
• Is titanium a solid, liquid, or gas at room temperature?
• Is platinum a solid, liquid, or gas at room temperature?
• Is oxygen a solid, liquid, or gas at room temperature?
• What are two elements that would have properties similar to magnesium?
• Is xenon a solid, liquid, or gas at room temperature?
• Is radon a solid, liquid, or gas at room temperature?
• Is hydrogen a solid, liquid, or gas at room temperature?
• Is potassium a solid, liquid, or gas at room temperature?
• Is sodium a solid, liquid, or gas at room temperature?
• Is chlorine a solid, liquid, or gas at room temperature?
• What are two elements that would have properties similar to chlorine?
• Is gold a solid, liquid, or gas at room temperature?
• Is silver a solid, liquid, or gas at room temperature?
• Is boron a solid, liquid, or gas at room temperature?
• Is beryllium a solid, liquid, or gas at room temperature?
• Is nitrogen a solid, liquid, or gas at room temperature?
• Is argon a solid, liquid, or gas at room temperature?
• What is the relationship among atoms, elements and compounds?
• What do these four elements - carbon, hydrogen, oxygen, and nitrogen, make up more than 96% of?
• What is the formation of ammonia from its its elements?
• What are the allotropes of carbon ?
• Why do lithium, sodium and potassium float on water?
• How many electrons do beryllium have?
• How many electrons does hydrogen have?
• How many electrons does helium have?
• How many electrons does copper have?
• How many electrons does gold have?
• How many electrons does silver have?
• How many electrons does neon have?
• How many electrons does calcium have?
• How many electrons does magnesium have?
• How many electrons does manganese have?
• How many electrons does boron have?
• Question #9e2ae
• Question #782fd
• What is Radon? Should you worry about it?
• Which of these elements is found in the smallest amount in living matter?
• I am a member of the boron family and am the most abundant metal in the Earth's crust. What am I?
• I am the head of the carbon family known as the "basis of life#? What am I?
• What is #Z_"atomic number"# for hydrogen?
• What element has the smallest atomic radius?
• What element has the largest atomic radius?
• Is nitrogen reactive?
• Is oxygen reactive?
• Is copper reactive?
• Is xenon reactive?
• Is helium reactive?
• Is calcium reactive?
• Is iron reactive?
• Is magnesium reactive?
• Is fluorine reactive?
• Is argon reactive?
• Is sodium reactive?
• What element is dull, not malleable, and a poor conductor of electricity?
• Question #f41d2
• Is neon stable?
• What is a process for removing impurities from crude iron?
• What are the component elements of sodium chloride?
• How many oxygen atoms are present in a formula unit of potassium sulfate?
• Why do some elements have symbols that are very different from the English names of the elements?
• What is the element that makes up 78% of the atmosphere?
• What happens when a pellet of sodium is sliced in two?
• What does the color of each elements symbol represent?
• Why are the spheres representing nitrogen and oxygen different colors?
• In what state are you most likely to find sodium?
• Why is chlorine more reactive than iodine?
• What supports the column of mercury inside the glass tube of a barometer?
• What characteristics are shared by calcium and magnesium?
• What is a pure substance that cannot be broken down by chemical or physical means?
• What elements are present in #Na_2(OH)_4#?
• What are the names of all the elements in #Na_2(OH)_4#?
• How do we determine the reactivity of the halogen elements?
• The salts of which ion, #M^+# or #M^(2+)#, are more likely to form an hydrate? Does hydration refer to the number of water molecules?
• What is an element that often combines with metals to form important ore minerals near hydrothermal vents?
• What is #"nascent oxygen"#?
• Do elements have similar chemical and physical properties when they are located in the same group or period?
• What do #He#, #Ne#, and #Ar# have in common?
• What are many elements a mixture of?
• What is the difference between the formula #CO# and the symbol #Co#?
• What is a substance that cannot be broken down into simpler substances?
• What are the three major gases present in the atmosphere?
• What do many elements found in nature exist as?
• What is the most abundant element in the universe?
• What does the number 232 represent in Thorium?
• What must two atoms have the same if they represent the same element?
• What is the most common gas in the air?
• What two actinides occur naturally on on Earth?
• What special name is given to the group of elements that are monatomic at room temperature?
• What would happen if oxygen were not available?
• What gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms?
• What is the abbreviation for calcium?
• How is helium different from neon and argon? How is it similar?
• Why does the air have nitrogen?
• Which element has 2 valence electrons and is in period 4?
• How many bonds can Carbon form? Why is this important?
• What does the nucleus of an atom of cobalt-58 contains?
• Of the following series of elements....which one is MOST REACTIVE, and which one is LEAST REACTIVE?
• What are all elements made of?
• Is fluorine molecular?
• Why do you think neon is used in signs?
• Which noble gas makes up about 1 percent of Earth's atmosphere?
• Where are the halogens located in the periodic table?
• Question #4a82b
• Question #d9f6a
• What can you infer about copper and silver based on their position relative to each other?
• How are potassium atoms formed from potassium ions?
• Why does helium exist only as single atoms?
• Which gas did Jacques Charles discover could be used as the source of hot air for a hot air balloon's envelope?
• How many electrons does #K^(1+)# have?
• Is chlorine a metal or a nonmetal?
• Is sodium a metal or a nonmetal?
• How can Xenon and Krypton form compounds with Fluorine if they are inert gases?
• How do you determine if an element is a transition element?
• Why is neon inert?
• What is a common use for chlorine?
• What are two atoms of the same element with different mass numbers called?
• At STP a 7.49-gram sample of an element has a volume of 1.65 cubic centimeters. What is the element?
• #O_2# and #H_2# are the same gas at what temperature?
• What is lithiums state of matter?
• An atom has 9 protons and 10 neutrons. What is the atomic number, the mass number and the symbol for this element?
• How did the element Uranium get its name?
• What elements are liquid at room temperature?
• What are all the elements the oxygen family?
• What are the four essential elements for life?
• What is the most common type of element?
• A neutral atom of sodium has 11 protons. How do you use this information to explain the total number of electrons that are in a sodium atom?
• Why would prefer to use the mercury instead the water in a sphygmomanometer?
• When does an element become a positive ion?
• What halogens are gases at room temperatur and pressure?
• If element A floats when placed in element B what can you deduce about the elements?
• What is the number of electrons in a potassium atom?
• What is the number of electrons in a carbon atom?
• What charge does a proton have?
• How many protons and how many electrons are in an oxygen ion that has a -2 charge?
• Iodine is an element in Group 7A of the periodic table. Which type of ion does iodine form?
• To which group do the alkaline earth metals belong?
• How do you determine the number of neutrons in carbon?
• The nitrogen-14 isotope has a mass number of 14 and an atomic number of 7. How many neutrons does it have?
• An iron atom has an atomic number of 26 and an atomic mass of 55.8 amu. How many protons does an iron atom have?
• What are the similarities and differences you would expect in the properties of silicon and diamond?
• How does helium differ from the other noble gases?
• Does neon combine easily with other elements? Why or why not?
• What is the most chemically active element?
• What is the most stable potassium ion?
• What is the most stable iodine ion?
• Gold has the highest what for the ability to be pulled into then water?
• What ion of barium is most stable?
• How many ionic protons are in calcium?
• #Na^+# is the chemical symbol for what ion?
• What is an atom that has gained or lost electrons called?
• Which elements in the actinide series are transuranium elements?
• What is one practical use of the element americium?
• Why does a hot air balloon rise when it ls heated?
• Question #f221a
• What is unique about carbon?
• Why don't equal masses of carbon atoms and oxygen molecules contain the same number of particles?
• Atoms of which element have two protons and two electrons?
• Which Group 16 element combines with hydrogen to form compound that has the strongest hydrogen bonding between its molecules?
• Atoms of which elements tend to gain electrons? Atoms of which elements tend to lose electrons?
• All living organisms contain carbon atoms. What are the important characteristics of carbon to enable this?
• Post 1984 pennies are composed of a zinc core and a copper shell. Why is this best?
• What are the characteristics/properties of the noble gases?
• An atom that has 117 protons in its nucleus has not yet been made. Once this atom is made, to which period and group will element 117 belong?
• Approximately how many elements are in the universe?
• What makes an element unique?
• Except for helium, how many electrons do noble gases have in their outer energy levels?
• Why are incandescent lamps with tungsten filaments filled with an inert gas such as argon?
• How did the element iron get its name?
• What are two major elements common in Europe and what is made with them?
• What type of element is nitrogen?
• Atoms of which element have the greatest tendency to gain electrons?
• How does the composition of most minerals differ from a pure element?
• How is each element unique on the periodic table?
• A substance consists of atoms which all have the same number of protons and electrons but different numbers of neutrons. Why is this substance an element?
• How are the negative fluoride ions formed from fluorine atoms?
• What is the total charge of the nucleus of a carbon atom?
• Which element has the largest atomic radius?
• What did scientists divide elements into?
• What is the letter "C" for the element carbon?
• How would you write the following elements as an ion: S, Mg, Br, Al?
• Potassium ions (K^+#) have a positive charge. What happens to a potassium atom's electrons when it becomes an ion?
• What element has the highest melting point of any metal?
• What are different forms of the same elements with different number of neutrons?
• Why might chlorine be added to drinking water?
• Sodium is more reactive than lithium. Why?
• What gas has 8 protons and 8 neutrons?
• Question #a419b
• What are the allotropes of carbon?
• Question #56530
• What is a halogen element?
• Question #156b5
• A neutral atom containing ten negative charges is what element?
• What are the gases in Earth's atmosphere in order of most abundant to least?
• Question #3f232
• Question #c54f5
• Question #e45b9
• What would the symbol be for a particle that has 11 protons, 12 neutrons, and 10 electrons?
• Approximately how many elements are known today?
• Which properties would NOT be associated with the alkali metals? #"A. High densities."# #"B. Low atomic masses."# #"C. Lustre."# #"D. Reactivity with water."#
• The properties listed in which option is NOT necessarily consistent with those of an alkaline earth metal? #"A. Forms a salt with TWO equivs of halide."# #"B. Forms a simple binary oxide."# #"C. React with water to give dihydrogen."# #"D.Are ductile"#
• How can carbon and hydrogen atoms both be composed of the same elements but be different compounds?
• What is the element symbol for californium?
• What would be different in your observations between Na and K?
• What is the name for the group of elements that are particularly unreactive?
• Question #ca166
• What is an example of a halogen?
• Does oxygen exists in the air as comidiat molecules?
• Is about 20 percent of the air made up of the element geonyx?
• What are diamond and graphite in relation to carbon?
• What are diamond and graphite?
• Is aluminum a building material?
• Is aluminum a semiconductor?
• Is carbon a building material?
• Is carbon an allotrope?
• Is selenium an allotrope?
• Is selenium a building material?
• How many types of atoms are in carbon?
• What are the number of types of atom in the element carbon?
• Is phosphourus an allotrope?
• How can you determine if an element is toxic?
• What group number is carbon in?
• What is the colour of freshly sublimed iodine?
• What is an example of two elements with similar properties and an explanation of how you know?
• What is the secondmost abundant element in the universe?
• What is the valency of the element?
• What are the most abundant elements in the universe?
• Question #196a7
• Nitrogen is a key element in the formation of what, which are substances necessary to living organism?
• Question #1bcba
• A chemical symbol represents what of an element?
• Group 18 rarely combines with other elements. They are the "loners" or noble gases. Why do these elements not need to bond with other elements?
• How does the electronic structure of the Noble Gases account for their lack of reactivity?
• Question #57574
• Why are #"H^+# ion and proton synonymous?
• Why are plastics good insulators?
• What are the elements in coal?
• What element is always a part of combustion?
• How does cyanide work?
• Noble gases are monatomic. What does monatomic mean?
• What is the major gas in the atmosphere?
• Question #57e12
• What are substances that are at their simplest state called?
• Are all elements in group 17 metals?
• Question #00b7b
• Can all solids sublime?
• Where on the periodic table are metals found?
• Question #d26e1
• How does the nucleus of a copper atom compare to the nucleus of a nickel atom?
• What precautions would you take before testing the behavior of rubidium (Rb) in water?
• What are three halogens and describe a property that they all share?
• Question #99268
• What properties enable carbon to form polymers and so many other compounds?
• Tin added to what makes bronze?
• Why do the negative ions have larger radii than the positive ions?
• What is the abbreviation for sodium?
• What is a combining form for potassium?
• Where does most of the sulfur in coal originate from?
• Why can a hydrogen atom become either an ion or a part of a molecule?
• Question #817c0
• Question #a0290
• Question #1835b
• Why is colored alcohol used as the liquid in a weather thermometer rather than mercury?
• How many protons does an aluminum atom contain?
• What element has the most similar properties to sodium?
• What is the last sublevel filled for carbon?
• What are examples of chemical formulas representing a diatomic molecule?
• Which element is in the p block, has 6 valence electrons and is in period 3?
• What is the combining form meaning calcium?
• Is #H_2# classified as an element?
• Why is graphite soft, and why is its melting point so high?
• What is the total number of electrons in an atom of Cu-65?
• Why does calcium have a higher melting point than potassium?
• Question #572c6
• How does a neon tube work?
• What is a positive or negative number assigned to to an element?
• #NH_4C_2H_3O_2#, is made of how many elements?
• What is the only metal that is liquid at room temperature?
• What are the group 18 elements called?
• What is the basic unit of any element?
• Why is mercury ideal for use in thermometers?
• Neutral flame is what type of flame with a balance of oxygen and acetylene?
• Question #b9f95
• What family has the lowest ionization energy?
• Why is silicon an important element economically?
• When full, the innermost electron shell of argon contains how many electrons, and the outermost shell contains how many electrons?
• What is unique about each element of the periodic table?
• The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium?
• Question #290b4
• In what period is carbon found?
• Helium was discovered on the sun in 1868, almost 30 years before it was discovered he on earth. How could that be possible?
• Copper is an element that is used in electrical wires. What is the smallest unit of copper that still maintains the characteristics of copper?
• What is the identity of zinc?
• If an element has too many or too few of what the element becomes unstable and will decay or not form at all?
• Which elements form diatomic molecules?
• What is the total charge of the nucleus of a nitrogen atom?
• How would you define pure substance? What are some examples of pure substances?
• What is one similarity and one difference between elements of group 2 and group 7?
• When carbon burns in oxygen what does it form?
• The element carbon is found naturally in several forms. What are some of these forms?
• Question #1ef00
• Of nitrogen, oxygen, and carbon dioxide, room temperature gases, which material is MOST involatile?
• What do all of the noble gases have?
• Build an atom using 4 protons, 5 neutrons, and 4 electrons. What element is it?
• How are sodium, chlorine, and aluminum alike?
• what is the difference between the reactivity and abundance of elements in Group 3A through Group 8A?
• What is the second major source of elements in seawater?
• How can I determine the color of iodide in a solution containing silver cation?
• How many neutrons are in calcium?
• What evidence is there (i) that sodium has a low melting point; that (ii) sodium is malleable and ductile?
• Question #c514a
• Which lanthanides are exceptions to the Aufbau principle?
• What is the only metal that is a liquid at room temperature?
• What is the hardest known material?
• What is the total number of protons and neutrons in the nuclide #""_35^80Br#?
• Which element in period 4 ls the most chemically active non-metal?
• What elements have melting and boiling points that are less than 10 °C (18 °F)?
• What did Uranium get its name from?
• Which elements are all highly reactive and are never found in Elemental forms in nature? Because of this, they are usually stored in mineral oil or kerosene (paraffin oil).
• Why is it dangerous to keep a sodium metal in your pocket?
• Why are the elements of group IA called alkali metals?
• Why is Cesium more reactive than Francium?
• Question #79959
• How will the density of mercury change when it is heated?
• Which gas is used to make blue prints?
• What are the basic units of matter that cannot be broken down into simpler substances by any chemical reaction called?
• Question #dac24
• How many protons, neutrons and electrons are in calcium?
• I do not uderstand the meaning of Eka - Boron . What is the meaning of Eka?
• For a given Period, which is the smallest atom?
• For which element(s) is/are the chemical symbols indicative of the element's americanized name?
• What is the electronic configuration of astatine?
• Why the lanthanide series is called lanthenide? Reason
• What elements are present in alkanes?
• Why actinides and lanthanides series are kept in the bottom of the periodic table? Reasons? Thank you.
• What is thallium 201?
• Why does phosphorus have a low melting point?
• Which is more stable vanadium or chromium? And why?
• Name a transition element which has no variable oxidation state?
• Question #e71de
• Question #7f389
• Are noble gases representative elements?
• Why d block elements are called outer transition and f block elements are called inner transition???? Please explain. Thanks a lot
• What is actual difference between atomic hydrogen and nascent hydrogen?
• Question #1d181
• What is the only element that can form both a cation and an anion?
• Question #c5ea9
• Why transition elements show tendency to form large number of complexes??
• Which element is named after one of our state?
• What are the allotropes of carbon?
• For the reaction #"Fe"_2"O"_3 + 2"X" -> 2"Fe" + "X"_2"O"_3#, if #"79.847 g"# #"Fe"_2"O"_3# reacts with excess #"X"# (#FW = "159.691 g/mol"# for the iron(III) oxide) to yield #"50.982 g X"_2"O"_3# and #"55.847 g Fe"#, what is the identity of #"X"#?
• First member of a group differs from the rest of the members of the same group. Why?
• What is the chemistry of the representative elements?
• An atom #a# possesses 30 massive, positively charged particles, and the atom #b# possesses 8 massive, positively charged particles. What are the identities of #a# and #b#?
• Are chromium, and copper isotopes?
• What are the reduction potentials of the halogens?
• Name and give symbol of the undiscovered element which have atomic number 119 by iupac method?
• What element has the chemical symbol Br?
• What is the chemical symbol for beryllium?
• Why is there no value for the covalent radius for argon?
• Of the known elements, how many are NON-METALS?
• Question #6548e
• What is the second most common element in the universe?
• I am the 2nd most abundant element in the Earth's crust and have 14 neutrons. What am I?
• Does selenium have more in common with sulfur or bromine?
• What element has never been made into a compound?
• What is the chemical symbol of phosphorus?
• How many protons are in a #""^179 Ta# nuclide?
• How many neutrons are in a #""^179 Ta# nuclide?
• Gold scientific name?