Unit 2

12345678910111213141516
Across
  1. 6. Negative charge
  2. 9. number of protons in the nucleus of an atom
  3. 10. a wave height from zero to crest
  4. 12. attractive force that holds the nucleus together
  5. 15. number of wave cycles that pass a give point per unit of time
  6. 16. Positive charge
Down
  1. 1. proposed that atoms were indestructible and indivisible
  2. 2. horizontal row
  3. 3. The total number of protons and neutrons in the nucleus of an atom
  4. 4. Contains electrons massless
  5. 5. the smallest particle of and element that retains its identity in a chemical reaction
  6. 7. used scientific method
  7. 8. neutral charge
  8. 11. vertical column
  9. 13. distance between crests
  10. 14. contains protons and electrons