Democritus
(460-370 BCE) A Greek philosopher who theorized that all matter could be reduced to particles that could not be divided, which he described as "atomos.
John dalton
English chemist and physicist who formulated atomic theory and the law of partial pressures
JJ Thomson
discovered the electron, plum pudding model
Ernest Rutherford
1909-solar system model of the atom, gold foil experiment- fired negative ions at thin sheet of gold foil, discovered the atomic nucleus and proposed a nuclear model of the atom .
Nelis Bohr
He obesrved differnet olors of ligth being emitted by different subsrances and discovered electron orbit the nucleaus on diferent paths.
Werner Heisenberg
A German physicist that speculated that there was no real certainty in where an electron was, and only tendencies. This broke down Newton's dependable laws to only probabilities.