-
460
democritus
Between 460 and 490 BC democritus created the first idea of an atom which was a balls of various mass create everything -
John Dalton
Dalton came up with his Atomic theory while experimenting with gasses which follow 5 rules
1 matter is made of atoms
2 all atoms in an element are identical
3 atoms of different elements have different mass and weight
4 Atoms of different elements combine in simple whole numbers to form compounds.
5 atoms can't be created or destroyed -
Thompson
In this model, atoms were known to consist of negatively charged electrons. using many different test found that they had positive protons as well -
Rutherford
Rutherford's atomic model was that the "plum pudding" model was in correct using the Geiger–Marsden experiment -
bohr
bohr found that the electron flows around the nucleus instead of nearby
