discovery of atom

dalton solid sphere model

1803

john dalton was the founder of atomic theory. these atoms were based on properties of mass that could be measures

Thompson plum pudding

1897

thompson related his plum pudding model to raisin bread with positive pudding and negative electrons within pudding

rutherford nuclear theory

1909

stated that atoms are mostly empty space and there is a dense, positive core at the center of the atom called the nucleus

bohr planetary model

1912

he came up with the theory that electrons do not spiral into the nucleus.

planetary model

1913

schrodinger quantum mechanical model

1930

present day model in which electrons have certain amounts of energy and moved in areas called orbitals

todays date

Apr 21, 2022