Across
- 2. an atom or molecule by one or more electrons
- 5. positive electrical charge
- 7. positive and negative
- 10. the electrons in the outermost shell, or energy level, of an atom.
- 11. the mass of a single atom
- 12. electric charge
- 13. negatively charged
- 14. the same number of protons.
Down
- 1. total number in protons and neutrons
- 3. number of protons
- 4. negative
- 6. negative electrical charge
- 8. same atomic number
- 9. positive