The Atomic theory

Events

Democritus

450 BC - 370 BC

The stuff made of little particles. That particles had diferent forms.
Atomos=Indivisible

Jhon Dalton

1766 - 1844

The substances were created by diferent atoms, always in the same proportions.
That atoms can't be created and not destroyed.

j.j.Thomson

1856 - 1940

He discobered the Electron. His model of atom was the "Chocolate chip cookie", a uniform atom with "chips" with positive and negative charge.

Rutherford

1871 - 1937

Discovered that the athom wasn't a full uniform part,in fact , it has a nucleus (positive and neutral charge) and around (negative charhe).

Bohr

1885 - 1962

The negative charge (electron) go round the nucleus. They are able to change the orbit.

Schrödinger

1887 - 1961

He made a new model of atom, but he didn't know were the atoms were located. So he put the in a "electronic cloud"