Atom Theory Timeline

Keona is the best!!

Ancient Greek Model!

400bc Democritus- If you cut an object in half many times it would be cut down into a small particle that couldn't be cut any more.

350bc Aristotle- Added that matter came in four elements Earth,Air,Fire,Water.

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Bohr model!

1913-Bohors model was consistent of a central nucleus (composed of protons and neutrons) surrounded by tiny particles called electrons.
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Broglie and schrodinger model!

1920- Broglie and schrodinger developed the electron cloud they theroized that the Bohr model was incomplete and that electrons do not orbit like planets