Thompson was responsible for the discovery of the electron

Democritus believed that all substances were made up of four basic element fire, water, wind, and earth

The electron cloud model explains how electrons can be found in orbitals and is the current model of the atom

Dalton proposed the first modern atomic model and thought that atom were indestructible spheres

Rutherford state that electrons orbit around the nucleus like planets around the sun or in fixed paths

The neutron was discovered by Dalton in 1809

Chadwick was credited with the discovery of the proton.

Democrtius proposed his theory in 1911.