Atomic History Models of the Atom

J.J. Thomson discovered the electron using

• gold foil and alpha particles.

• oil drops.

• a cathode ray tube.

• emission spectra of a hydrogen atom.

Rutherford realized that the atomic nucleus was positively charged because

• it attracted alpha particles.

• it deflected alpha particles.

• it had no effect on alpha particles.

• it produced alpha particles.

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Niels Bohr added _______________ to the model of the atom.

• electrons.

• a nucleus.

• neutrons.

• energy levels.

J.J. Thomson discovered electrons, and he also knew that atoms are neutral. From these two facts, Thomson inferred that the atom also contains

• positive material.

• a nucleus.

• neutrons.

• energy levels.

Which of the following is the best description of J.J. Thomson's model of the atom?

• a featureless, indivisible sphere

• a sphere of positive material with electrons embedded in it

• mostly empty space with electrons randomly orbiting around a positive nucleus

• mostly empty space with electrons located in set orbits around a positive nucleus.

Who discovered that the atom had an small, dense, positively charged center?

• Ernest Rutherford

• J.J Thomson

• Robert Millikan

• John Dalton

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Place the following atomic models in order, from earliest to latest:

A) Rutherford B) Thomson C) Dalton

• B, C, A

• C, A, B

• A, C, B

• C, B, A

What can you conclude from the fact that scientists continue to update the atomic model?

• New information about atoms continues to be discovered
• Old information about atoms is completely useless
• Scientists did not have any information about atoms until a few years ago
• Scientists still have no idea what atoms look like

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Who named the positive center of the atom the "nucleus?"

• Democritus

• Dalton

• Thomson

• Rutherford

Which scientist proposed a new atomic model after discovering the electron in 1897?

• Dalton

• Thomson

• Rutherford

• Bohr