-
400 BCE
Democritus
Contributed to atomism, theory that everything is made up of microscopic indivisible particles (first to suggest atoms) -
John Dalton
Discovered the Atomic Theory (every form of matter is made up of individual particles) -
Dmitri Mendeleev
Created periodic table -
Eugene Goldstein
Discovered the proton -
J.J. Thomson
Discovered electron -
Robert Millikan
Discovered electric charge -
Ernest Rutherford
Discovered nucleus -
Niels Bohr
Discovered that electrons travel in separate orbits around the nucleus -
Max Planck
Created quantum theory and won the Nobel Prize for it -
Werner Heisenberg
Created the theory of quantum mechanics -
Erwin Schrodinger
Created quantum mechanical model -
James Chadwick
Discovered the neutron
