5th century b.c

5th century greek

460

The greeks are the first to come up with the idea of the atom. It really means indivisible. They thought that it can't be split.

John dalton

Nov 11, 1800

he preformed experiment with various chemicals to show that they consist of elementary lumpy particals

J.J Thomson

Oct 11, 1897

Thomson knew electrons were negative charge so he found the positive

rutherford

Oct 11, 1911

He discovered that each atom had a nuclues he shoot alpha particals in to a gold piece

Bohr

Oct 11, 1912

He figured out that electrons orbit the nucleus and there 5 diffrent orbits