-
101
Thales - 620 BCE
first person to investigat basic principles -
101
Democritus- 440 BCE
first atomic theory, cutting the cheese though experiment -
101
Aristotle- 340 BC
didn't believe in the atomic theory. thought it put a limit on the gods -
Sir Isaac Newton
atoms held together by attractions, matter formed of solid massy particles -
John Dalton
discovered atomic theory, water and air -
Henri Becquerel
dicovered radiactivity -
JJ Thompson
disovered electron, plum pudding model, used cathode ray tube -
Robert Andrew Millikan
oil drip experiment, finds charge of individual electron -
Ernest Rutherford, Hans Gieger, Ernest Marsden
Gold Foil, proved part if atom is positive charged -
Ernest Rutherford
gold foil experiment, discover nucleus and proton -
Niels Bohr
electrons had orbits -
Francis Aston
mass spectograph "whole number rule" isotopes -
Erwin Schrodinger
Quantim Mechanical Model of Atom, used math equation to find probability of an electron would in a certain position -
James Chadwick
discovered neutron
