-
101
Thales - 620 BC
First person to investigate the basic Principles of the Atom. -
101
Democritus- 440 BC
Performed the experiment called "Cutting the Cheese".
Made the first Atomic Theory. -
101
Aristotle- 340 BC
Believed that all substances were made of fire, air, water, and earth. -
Newton
Said that atoms are held together by tractions and forces. -
Dalton
Performed the "Atomice Theory Experiment". -
Thomson
Created the electron. -
Rutherford
Performed "Gold Foil Eperiment".
Shot a Beam of Alpha Particles at a sheet of gold foil. -
Bohr
Realized electrons orbited around the nucleas of an atom. -
Francis Aston
Invented the mass spectograph. -
Schrodinger
Said that electrons occupy a certain orbit around the nucleas of an atom. -
Chadwick
Discovered the neutron.
