History of the Atom

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Last updated 9:52 AM on 5/17/26
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11 Terms

1
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Who first proposed atomic theory around 500 BC?

Democritus

2
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What did John Dalton describe atoms as?

Solid spheres

3
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Who proposed the plum pudding model in 1897?

J.J. Thomson

4
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What particle did J.J. Thomson discover?

Electrons

5
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What is the plum pudding model?

A ball of positive charge with electrons inside

6
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Who carried out the gold foil experiment?

Ernest Rutherford

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What did Rutherford’s nuclear model suggest?

Atoms have a central positive nucleus

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Where did Rutherford think electrons were?

In a cloud around the nucleus

9
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Who suggested electrons orbit in shells?

Niels Bohr

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Who discovered protons?

Ernest Rutherford

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Who discovered neutrons?

James Chadwick