Atomic Models

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Questions

• Question #2b905
• Why is the atomic model useful?
• Why are atomic models necessary?
• How did Rutherford know that the nucleus was positively charged?
• What are cathode rays made of according to J. J. Thomson?
• Why is Rutherford’s experiment called the gold foil experiment?
• What are elements made of according to John Dalton?
• What are the conclusions of the Cathode ray experiment?
• How many electrons can the fourth energy level hold according to Niels Bohr?
• Would an electron have to absorb or release energy to jump from the second energy level to the third energy level according to Niels Bohr?
• Why could Bohr’s model be called a planetary model of the atom?
• How are atomic models used?
• What are some common mistakes students make with atomic models?
• Who came up with the plum pudding model of the atom?
• Question #b3781
• Question #13bf5
• Question #65395
• Might our current models of the atom change in the future?
• Question #a0dbd
• Question #b99b3
• What is an electron cloud?
• Are the electron shell and the electron cloud the same thing?
• In the modern atomic model, the electron cloud is denser in some locations than in others. What do the denser areas represent?
• What does the electron cloud model describe?
• Which has more mass - the nucleus or electron cloud?
• Where is the electron cloud located in the atom?
• Why do electron clouds repel?
• How do electrons move in the electron cloud?
• How can you determine electron cloud size?
• Question #ef968
• Why is a model made to be simpler than the thing that it represents?
• Why does the electron not crash into the nucleus of an atom?
• Is the nucleus of an atom neutral, positively or negatively charged?
• Question #ed86f
• Why did Rutherford draw the conclusions that he did from his famous gold-foil experiment?
• What are the assumptions in Dalton's atomic theory?
• Which statement is INCONSISTENT with Dalton's atomic theory?
• What is the Plum Pudding Model?
• Question #a117e
• Where are neutrons located?
• Question #38c37
• What was Democritus's atomic theory?
• Question #cd4b4
• What is the difference between an orbit in Bohr's model of the atom and an orbital in the quantum mechanical view of the atom?
• How is Thomson's model of an atom different from Dalton's model?
• How do you use electron-dot notation to illustrate the number of valence electrons present in one atom?
• Why are scientific models useful?
• What are scientific models?
• What was Niels Bohr's explanation for the observation of atomic spectra?
• What did Democritus do?
• In 1897, who described the atom using the "raisin bun model"?
• What did John Dalton's atomic theory state?
• Sally is making a model of a Mg atom with an atomic mass number of 24. She has balls for the protons, neutrons, and electrons. She has added 6 neutrons to her model. How many more neutrons does she need to add to complete her neutral atom of magnesium?
• What is the Bohr-Bury scheme of arrangement of electrons in an atom?
• Question #64e2e
• Why is a stairway a good model for the energy levels in an atom?
• How you would show J. J. Thomas's model of the atom using small beads and clay?
• Using this model of a helium atom, what is the atomic number and mass number?
• What were the contributions of de Broglie, Hund, and Pauli to our understanding of the atom?
• Question #27b1f
• Why did Thomson change Dalton's model of the atom? What did he propose as an alternative?
• Question #19b6e
• Who was #"John Dalton"#?
• Question #68eba
• Who originally described atoms as small, indivisible spheres?
• Who originally determined that electrons move around the nucleus of an atom?
• Did Ernest Rutherford's experiment lead to the nuclear model of the atom?
• Did Ernest Rutherford's experiment establish the plum budding model of the atom?
• Did Robert Millikan's postulates form the most accepted theory for atomic structure?
• Did Robert Millikan's results impact on determining the charge of an electron?
• Whose work directly resulted in the development of an atomic model that has negative electrons stuck within a sea of positive material?
• Question #a7007
• How would you construct a model to show the atomic structure for an oxygen atom?
• What is Thomson's atom?
• Question #b5319
• Who was the man who lived from 460 B.C. to 370 B.C. and was among the first to suggest the idea of atoms?
• How would Democritus describe the idea of an atom?
• Why was the #"plum pudding model"# of J. J. Thomson rejected?
• Question #d56d7
• Why is it so much easier to remove an electron from an atom of a large atomic mass than it is to remove a proton?
• Question #cfb9a
• How does mixing water and alcohol show that atoms have a lot of empty space?
• As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to be true?
• Question #95e91