Across
- 3. area around the nucleus that electrons can orbit
- 6. when an atom has gained energy and electrons have moved to higher levels
- 8. neutral particles in the nucleus
- 9. gives the number of protons & electrons in the atom
- 10. largest category of elements on the periodic table
- 12. positively charged particles in the nucleus
- 13. horizontal rows on the periodic table
- 16. center of the atom that contains protons & neutrons
- 17. small particles that make up all matter
Down
- 1. negatively charged particles that orbit the nucleus
- 2. electrons in the outermost level
- 4. have properties of both metals and non-metals
- 5. most stable arrangement of an atom
- 7. particle of light
- 11. gives the number of protons in the atom
- 14. vertical columns on the periodic table
- 15. variations of a given element that have a different number of neutrons