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100
Democritus
Democritus in 450BC coins the term "atom" which means uncuttable. Describes the smallest piece of matter. -
Period: 100 to
History of the Atom
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Antoine Lavoisior
Antoine Lavoisior defined the element as something that could not be broken down further by the methods of chemistry. -
John Dalton
Dalton proposes that elements are made of atoms of a single type. -
J. J. Thomson
Thomson proposes atoms are made of protons neutrons and electrons all mixed together. Termed "plum pudding model" -
Ernest Rutherford
Ernest Rutherford fires alpha particles at gold foil. Concludes that atoms have postively charged nucleus' with orbiting electrons
