John dalton created the very first atomic theory
1. Atoms are tiny invisible particles
2. Atoms of one element are all the same
3. Atoms of different elements are different
4. compounds form by combining atoms
Discovered protons and the nucleus and that positive charged particles are in the center and are mostly empty space
Improved on the rutherfodr's model.
Proposed that electrons move around the atom in specific layers or shells.
discovered neutrons ( particles with no charge also found within the nucleus)
The new atomic model has electrons moving around the nucleus in a cloud