atomic theory

3. Greek philosopher who was the first to suggest the existence of the atom
6. discovered the electron
9. the "plum pudding" model
10. the number of protons and neutrons in the nucleus
12. the small, dense, and positive center of an atom composed of protons and electrons
13. discovered the existence of the proton

1. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
2. an atom that has the same number of protons but different number of neutrons an therefore a different mass
4. through the Gold Foil experiment, he discovered the nucleus of an atom
5. first experiment based theory
7. confirmed the presence of the neutron
8. atoms were invisible, indivisible, and indestructible
11. the number of protons and neutrons in the nucleus of an isotope