-
101
Aristotle-384
Didnt believe in the Atomic Theory. Believed all substances were made of fire, water, earth, and air -
101
Democritus- 400 B.C.
First person to think of the atom thought it was a solid sphere -
101
Thales 624 B.C
Thought all things were made of water . -
101
Dalton
Atomic theory , first to have experimental evidence. -
Newton
he agreed with democritius -
Henri Becquerel
discovered reactivity couldnt explain it -
Joseph John Thompson
discovered electron -
Ernest Ruthford
discovered nucleus -
Millikan
Found the charge of an electron. -
Niels Bohr
thought electrons orbited around the nucleus -
Erwin Schrodinger
Atomic model was the quantum mechanical model -
James Chadwick
proved the exsistence of neutrons