Across
- 1. Can be positive or negative
- 6. The weakest kind of radiation
- 7. The subatomic particle that does not have a mass
- 11. When an atom emits particles (decay)
- 13. The subatomic particle with a neutral charge
- 14. The term for a negative ion
- 16. Equal to the number of protons plus neutrons
Down
- 2. The average of all isotopes
- 3. Equal to the number of protons
- 4. The center of the atom
- 5. The strongest kind of radiation
- 8. Atoms with a different number of neutrons than usual
- 9. The subatomic particle with a positive charge
- 10. The term for a positive ion
- 12. The smallest unit of matter that still has unique properties
- 15. Atoms that have a non-neutral charge