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101
Thales 624BC
Thought all things were mad of water. -
101
Democritus 460BC
First person to think of the atom. Thought it was a solid sphere. -
101
Aristotle 384BC
All substances were made of fire, water, earth, and air. No Atomic theory. -
Sir Issac Newton
"Matter is formed of solid, massy impenetrable particles. -
John Dalton
The Atomic THeory. First person to have experiment evidence. -
Herni Bacquerel
Discovered radioactivity. -
Joseph John Thompson
Discovered electron. Cathode Ray experiment. -
Ernest Rutherford
Discovered the nucleus. Gold Foil Experiment. -
Milikan
Found the charge of an electron. -
Niels Bohr
Electtrons orbit around the nucleus. -
Schrodinger
Improved Bohr's model. Quantum Mechanical model. -
James Chadwick
Proved the existence of neutrons.