Across
- 2. Have a positive charge.
- 4. Helium, Neon, Argon, Krypton, and Xenon.
- 5. Have no electrical charge.
- 6. have +1 charge.
- 8. made the early model of the atom.
- 9. An atom that carries an electrical charge.
- 10. Indicates number of energy groups.
Down
- 1. Have a negative charge.
- 3. Semiconductors or semi-metals
- 7. Number of Protons.