Help with the following questions???
#1)# What is the net charge of an atom with no electrons?
#2)# What is the mass number of a nitrogen atom with #8# neutrons?
#3)# What is the net charge of a nitrogen atom with only #6# electrons?
#4)# What is the mass number of a chlorine atom with #18# neutrons?
#5)# What is the atomic number of a nitrogen-15 isotope?
#6)# What is the element with atomic number #17# ?
#7)# What is the name of element #X# ?
#8)# What is the net charge of a nitrogen atom with #8# electrons?
1 Answer
Sep 10, 2016
- Protons are known to be positively-charged particles. Therefore, an atom with only protons can only be positively charged.
- The mass number is the total number of protons plus neutrons. Therefore, the mass number must be
#7+8=bb(15)# . - The net charge only incorporates charged particles, so with
#7# protons (positive) and#6# electrons (negative), the net charge is simply#7xx(+) + 6xx(-) = bb(+1)# . - Same idea as
#2# . Therefore, the mass number is#17 + 18 = 35# . We write that as#""^35 X# , where#X# is the chemical symbol. - See
#2# . - The element is identified by its atomic number, which is its number of protons. Therefore, with
#17# protons we have#bb("Cl")# , or chlorine. Look at any periodic table to convince yourself that the#17# th element is#"Cl"# . - This question doesn't make sense. The element always has a name, if it's a previously-discovered element. Otherwise it's called the latin for "unknown element number
#X# "... #bb(-1)# . See#3# .
