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Democritus
All Matter is made of "Atoms"! They are small, hard, and can not be divided into smaller particles!
430 BC
1810
John Dalton
Atoms are tiny, solid 'balls'. I'm going to make the first atomic theory that talks about this.
J.J Thompson
Atoms are smaller than you think. There is a negatively charged atom, the electron. They call my model of this the "raisin bun model".
1886
Ernest Rutherford
The atom has protons and the nucleus. Atoms have positive particles in the middle, and it is mostly empty.
1911
Robert Millikan
Using the oil drop experiment, I will be able to deduce the electric charge of an electron.
I'm going to improve upon Rutherford's models and prove that electrons moves around the nucleus in "shells".
Niels Bohr
1911-1913
James Chadwick
Along with Rutherford, I am able to discover neutrons which are particles with no charge.
1932
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