Atomic Theory History
John Dalton
Developed an atomic theory to explain observations about compounds and how they react. |
J. J. Thomson
Discovered the electron using a cathode ray tube. |
Ernest Rutherford
Conducted an experiment using gold foil and alpha particles and concluded that atoms are mostly empty space. Discovered the nucleus - dense center of an atom which is positively charged. |
Neils Bohr
Said that electrons travel around the nucleus in specific energy levels. |