-
101
Thales- 624 BC
thought all things were made of water -
101
Democritus 460 BC
first person to think of atom thought it was a solid sphere -
101
Aristotle 384-322 BC
didnt believe atomic theory said every thing was made of earth fire water or air -
Issac Newton
matter is formed of solid massy inpenetrable particals -
Dalton
atomic theory -
Henri Becquerel
discovered radioactvity -
Joseph John Thompson
discovered electron -
Ernest Ruthaford
discovered neucleus -
Millikan1909-1912
found charge of electron -
Bohr 1911-1916
created Bohr model
electrins orbited atom -
Schrödinger
predicts odds of electron location -
Chadwick
proved neutrons