-
101
Thales: 624 B.C.
Thought all thing were made of water -
102
Democratis: 460 B.C.
First person to think of the atom. Thought it was a solid sphere. -
103
Aristotle: 384 B.C.
Didn't believe in atomic thoery. Believed everything was made up of fire, water, earth, and air. -
Sir Issac Newton
Stated that matter is formed of solid, massy impenetrable particles. -
John Dalton
Atom theory had expirimental evidence -
Henri Bacquerel
Discovered radioactivity -
Rutherfird
Discovered Nucleus -
Millikan
Found charge of electron -
NIels Bohr
found charge of electron -
Erwin shrodinger
Proved Bohr model wrong -
James Chadwick
proved the existence of neutrons