space provided.
Contribution
1. He discovered electron
2. He discovered proton
3. He discovered neutron
A famous philosopher who proposed that all
substances are composed of four elements: air,
earth, fire and water in different proportion
5. He concluded from his studies that electrons are
moving on its orbits with specific energies around
the nucleus called energy level. He developed the
Nuclear Atomic Model.
6. He discovered proton and that an atom has a
massive center core called nucleus​