Physical science crossword

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Across
  1. 3. an effect when 2 unlike particles are in contact with one another
  2. 6. increases as you move from period to period
  3. 7. a space where electrons can be found
  4. 8. effect that reduces the nuclear pull on the valence electron
Down
  1. 1. a subdivision of electron shells separated by electron orbitals
  2. 2. electron on the furthest energy level
  3. 4. Found on the shells of an atom
  4. 5. positively charged particles found in the nucleus