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500
Democritus
Born 460 BC, Died 370 BC
He's known as the "Father of Modern Science."
Contributions to the Atomic Theory:
1. Declared everything is composed of atoms
2. Atoms are indivisable, and are the smallest thing on Earth -
Period: 500 to
Creators
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Dalton
Sep 6, 1803 -July 27, 1844
Researched colorblindness.
Contributions to Atomic Theory:
1. Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
2. In chemical reactions, atoms are combined, separated, or rearranged. -
Thomson
Born Dec. 18, 1856, died Aug 30, 1940
He was awarded the 1906 Nobel Prize in Physics for the discovery of the electron.
Contributions to Atomic Theory
1. suggest the theory of the atom containing positive and negative particles
2. demonstrated the latter which he called electrons -
Rutherford
Aug 30, 1831 - Oct 19, 1937
Became known as the father of nuclear physics.
Contributions to the Atomic Theory:
1. Gold Foil experiment
2. Rutherford used alpha radiation to convert nitrogen into oxygen through the nuclear reaction 14N + α → 17O + proton. -
Bohr
Oct 7, 1885 - Nov 18, 1962
Received the Nobel Prize in Physics in 1922.
Contributions to Atomic Theory:
1. understanding atomic structure
2. understanding quantum mechanics
