history of the atom

What did Democritus believe about the atom

All matter consists of invisible particles called atoms. Atom are indestructible, solid and invisible. All atoms are the same

What did John Dalton believe about the atom

Atoms of the same element are the same atoms of different elements differ. Atoms are spherical and in motion

What did JJ Thomson discover

Electron

What did Ernest Rutherford discover

The existence of the nucleus through the gold foil experiment

What did Niels Bohr believe about the atom

Electrons orbit the nucleus in shells. Elements chemical properties are determined by how many electrons are in the outer most shell.

What did Erwin Schrödinger discover

Electrons move in a wave form

What did James Chadwick discover

Neutrons