atomic theory

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Across
  1. 3. Greek philosopher who was the first to suggest the existence of the atom
  2. 6. discovered the electron
  3. 9. the "plum pudding" model
  4. 10. the number of protons and neutrons in the nucleus
  5. 12. the small, dense, and positive center of an atom composed of protons and electrons
  6. 13. discovered the existence of the proton
Down
  1. 1. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
  2. 2. an atom that has the same number of protons but different number of neutrons an therefore a different mass
  3. 4. through the Gold Foil experiment, he discovered the nucleus of an atom
  4. 5. first experiment based theory
  5. 7. confirmed the presence of the neutron
  6. 8. atoms were invisible, indivisible, and indestructible
  7. 11. the number of protons and neutrons in the nucleus of an isotope