apt review

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Across
  1. 1. horizontal row on periodic table
  2. 5. a neutral particle
  3. 8. bad heat/electricity conductor
  4. 9. a particle with a positive charge
  5. 11. what hold atoms together in molecules
  6. 12. electron pair between two atoms
  7. 13. good heat/electricity conductor
  8. 15. group of atoms bonded together
  9. 16. particle with a negative charge
Down
  1. 2. one or more positive/negative charge
  2. 3. union of separate elements
  3. 4. atoms together in metallic substance
  4. 6. column in periodic table
  5. 7. basic unit of a chemical element
  6. 10. electron in the outer shell of an atom
  7. 14. is neutral: contains cations/anions