-
400
Democritus
First model of atom; first to think about an atom. -
400
Aristotle
Only 4 elements; opposed Democritus' theory. -
500
Leucippus
Everything is made of something. -
Issac Newton
3 laws of motion. -
John Dalton
Dalton's Atomic Theory. -
JJ Thomson
Discovered electron; used rathode ray tube. -
Rutherford
Atoms have + charges in a small, dense nucleus. -
Niels Bohr
Electrons travel on rings. Takes evergy to move from ring to ring. -
Schroedinger
Described a cloudlike region where electrons are liekly found. -
John Chadwick
Discovered the neutron. Noticed odd difference in masses. -
Thales Of Miletus
Noticed static. Paved way for future discoveries. -
Period: to
Scientists