-
101
Thales - 620 BC
1st person to investigate basic principles, the orgins of the subtances of matter, and founder of school of natural physcoloy -
101
Democtrius- 440 BC
He came up with the word "Atom" -
101
Aristotle- 340
He believed that all subtances were made up of fire, water, air, earth -
Sir Isaac Newton
He helped out the Atomic Theory -
John Dalton
Dalton's Atomic Theory -
Henri Becquerel
dicovered that elements could be radioactive but didnt know why -
JJ Thompson
discovered the electron -
Robert Andrews Millakan
Found the charge of an indiviual electrons -
Ernest Rutherford
Discovered the nuecleus and proton -
Miels Bohr
Electrons traveled in orbit -
Francis Aston
Found Isotopes -
Erwin Schrodinger
Quantum Mechanical Model of Atom -
James Chadwick
discoverd the Nuetron
