-
101
Thales- 624BC
Believed everything was made of water. -
102
Democritus- 460BC
Thought up the atom, believed it was a sphere. -
103
Aristotle- 384BC
Believed all substances were made of fire, water, earth, and air. -
Issac Newton
Believed matter is made of solid, imepenetrable particles. -
John Dalton
First person to have experimental evidence of the atom. -
Henri Becquerel
Discovered radioactivity. -
J.J. Thomson
Discovered the electron. -
Ruthford
Discovered the nucleus. -
Millikan
Found the charge of an electron. -
Niels Bohr
Created Bohr model. Thought electrons orbited the nucleus. -
Erwin Schrodinger
Created Quantum mechanical model. Predicted Electron location. Proved the Bohr model wrong. -
Chadwick
Proved the existance of Neutrons.