Isaiah's Electricity puzzle

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Across
  1. 2. when a material doesn't allow easy transfer
  2. 4. circuit, when there is no current
  3. 7. Opposition to the flow of current
  4. 9. current, flows in one direction
  5. 10. possibility of doing work
  6. 14. when a electron can move easily between material
  7. 16. circuit, has no resistance
  8. 17. number of electrons in a incomplete outer shell that it can take or lose
Down
  1. 1. smallest negative particle
  2. 3. number of protons in the nucleus balanced by a equal amount of orbiting electrons
  3. 5. unit to measure potential difference
  4. 6. a path for a current
  5. 8. Material that isn't good or bad at conducting electricity
  6. 11. current, periodically reverses direction
  7. 12. when electron and protons are equal
  8. 13. smallest positive particle
  9. 15. when electrons escape the outermost ring and become able to be transferred