Intro. Atomic History

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

• Democritus

• Dalton

• Thomson

• Rutherford

Which scientist discovered that the atom has parts - which means it can be divided?

• Democritus

• Dalton

• Thomson

• Rutherford

Which scientist first suggested that atoms could join?

• Democritus

• Dalton

• Thomson

• Rutherford

Which scientist believed that elements differed from one another because their atoms had different mass?

• Democritus

• Dalton

• Thomson

• Rutherford

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

• Dalton

• Thomson

• Rutherford

• Bohr

Who discovered that atoms are mostly empty space?

• Dalton

• Thomson

• Rutherford

• Bohr

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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