-
Period: 322 to
Aristotle
Disagreed with Democritus`s idea that atoms move through empty space. -
Period: 370 to 460
Democritus
First person to suggest that matter could not be infinitly divided. -
Period: to
John Dalton
"Atoms are the smallest particles of matter and are indivisble and indestructible. -
Period: to
J.J Thompson
Concluded that the mass of the particle was much less than that of the Hydrogen atom, which disproved Dalton`s theory that atom were indivsible -
Period: to
Robert Millikan
Determined that the magnitude of the charge of the electron was 1.602x10 ^-19 coulombs -
Period: to
Ernest Rutherford
Studied how positively charged a-particles interacted with sold matter. -
Period: to
James chadwick
Demonstrated that the nucleus had another neutral subatomic particle, the neutron -
Chadwick won Nobel proze
Discovery of the neutron.