chemistry crossword puzzle

123456789
Across
  1. 2. the state that has the higher potential energy
  2. 4. distance between corresponding points
  3. 7. all forms of electromagnetic radiation form
  4. 8. energy is the minimum quantity of energy that can be lost or gained
  5. 9. refers to the emission of electrons
Down
  1. 1. the four bands of light
  2. 3. a form of energy
  3. 5. lowest energy state
  4. 6. defines as the number of waves that pass a given point