Chemistry module 3

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Across
  1. 3. Rutherford discovered the existence of these
  2. 4. isotopes behave this way in chemistry
  3. 6. how many protons an atom contains (2 words)
  4. 7. Crookes discovered the existence of these
  5. 9. opposite charges
  6. 10. like charges
  7. 11. total number of protons and neutrons (2 words)
  8. 14. same number of protons but different number of neutrons
  9. 16. electromagnetic radiation
Down
  1. 1. distance between crests (or troughs) of a wave
  2. 2. lowest possible energy state for a given substance
  3. 3. measurable constant in nature that doesn’t change (2 words)
  4. 5. number of wave crests (or troughs) that pass a given point each second
  5. 8. standard unit for frequency
  6. 12. height of the crests or depth of the troughs
  7. 13. the visible light spectrum
  8. 15. electron moves from an orbit close to the nucleus to an orbit farther away