Unit 2

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Across
  1. 3. ion with a positive charge
  2. 4. number of wave cycles that pass a give point per unit of time
  3. 5. High luster
  4. 7. used scientific method to revise democritus's model
  5. 8. a wave height from zero to crest
  6. 11. the amount of energy required to move an electron from one energy level to another
  7. 13. Stair step line
  8. 14. atoms that have the same number of protons but a different number of neutrons
Down
  1. 1. poor conductors
  2. 2. distance between crests
  3. 6. vertical column
  4. 8. smallest particle of an element that retains its identity in a chemical reaction
  5. 9. contains protons and neutrons
  6. 10. ion with a negative charge
  7. 12. horizontal row