History of Atomic Models

Whose model suggested that negative particles were mixed in with positively charged material - like seeds in a watermelon?

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• Albert Einstein

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NGSS.HS-PS1-3

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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NGSS.MS-PS1-1

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

• Democritus

• Dalton

• Thomson

• Rutherford

Which scientists believed an atom was indivisible? (Choose all correct responses.)

• Democritus

• Dalton

• Thomson

• Rutherford

In the model nicknamed "the solar system model" what are the electrons like?

• the sun

• the nucleus

• the planets

• the moon

In the atomic model nicknamed the "plum pudding" model, what do the plums represent?

• the nucleus

• the atom

• the electrons

• the positive material

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NGSS.MS-PS1-1

How did Rutherford come up with his atomic theory?

• Testing gamma rays against dogs

• Testing alpha rays of radiation against gold foil

• Testing zinc against silver

• Testing zinc against gold

Ernest Rutherford discovered that atoms were mostly _________________. 

• negatively charged
• positively charged
• electrons
• empty space. 

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NGSS.MS-PS1-1