Across
- 6. Negative charge
- 9. number of protons in the nucleus of an atom
- 10. a wave height from zero to crest
- 12. attractive force that holds the nucleus together
- 15. number of wave cycles that pass a give point per unit of time
- 16. Positive charge
Down
- 1. proposed that atoms were indestructible and indivisible
- 2. horizontal row
- 3. The total number of protons and neutrons in the nucleus of an atom
- 4. Contains electrons massless
- 5. the smallest particle of and element that retains its identity in a chemical reaction
- 7. used scientific method
- 8. neutral charge
- 11. vertical column
- 13. distance between crests
- 14. contains protons and electrons