-
400 B.C
he made first model of atom . -
400 B.C
he opposed Democritus' theory . he thought only 4 elements were in everything . ( earth , fire , air, water , ) -
500 BC . He thought everything was made up of something .
-
3 laws of motion
-
- All matter is made of atoms
- all atoms of the same element are the same , atoms made of different elements are different
- Atoms combine to make compounds
- Atoms are rearrange .
-
discovered the electron and made the plum pudding model
he used the cathode ray tube to discover electron . -
said atoms have positive charges in a small , dense nucleus .
'gold foil experiment' -
said electrons travel on rings , the more the rings , the higher the energy level . they can move from ring to ring but it takes energy .
-
Described a cloud - like region where an electron is likely to be found
-
Discovered the Nuetron .
-
585 BC . Thales noticed static , which paved for future discoveries .
