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Timeline of Atomic Theory
Category:
Other
Updated:
18 Oct 2018
Timeline of Atomic Theory from group Billy Gillman, Kamile Yocum, and Quintin Allen.
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Quintin
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Events
Sir William Crooke demonstrated that atoms had negative charges.
Periods
Democritus devises first atomic theory.
John Dalton defined an atom as a small indivisible particle that cannot be created or destroyed.
J. J. Thomson discovered the ratio of charge to mass of electrons.
Röntgen discovered x-rays, and Becquerel discovered radioactivity.
Rutherford discovered the nucleus.
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