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400 BCE
Democritus
- Born: 460 BC
- Died 370 BC
- Known for the formulation of an atomic theory of the universe
- Theorized tiny particles somehow had looks attached to them so they could stick together
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John Dalton
- Born: 1766
- Died: 1844
- English chemist
- Known for atomic theory
- Pioneer meterorologist, kept daily records for 57 years
- Atomic Theory: All matter is made of atoms. Atoms are invisible & indestructible.
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Joseph John Thompson
- Born: December 18, 1856
- Died: August 30, 1940
- Proposed plum pudding model in 1904
- Published 13 books & 200+ books in his lifetime
- Nobel prize winner in 1906
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Ernest Rutherford
- Born August 30, 1871
- Died October 19, 1937
- Pioneer of nuclear physics & the 1st to split the atom
- 1908- Nobel Prize in chemistry - atomic structure
- Overturned Thompson's model in 1911
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Niels Bohr
- Born: October 7, 1885
- Died: November 18, 1962
- Danish physicist
- Nobel Prize in physics in 1922
- Hydrogen atom theory (1913) - based on the quantom theory
