Chemistry crossword

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Across
  1. 2. the weight of an element including its isotopes
  2. 4. the separation of electrical charges in a molecule
  3. 7. location of protons and neutrons in an atom
  4. 8. describes a molecule which does not dissolve in water because it is nonpolar
  5. 10. number of protons in an element
  6. 12. describes a polar molecule which dissolves in water
  7. 14. an atom that has lost electrons and has a positive charge
Down
  1. 1. a pure substance made up of only one type of atom
  2. 3. a subatomic particle with a positive charge
  3. 5. a subatomic particle with a negative charge
  4. 6. bonds that water forms between polar molecules
  5. 9. an atom with a positive or negative charge
  6. 11. a bone in which atoms take or donate electrons to other atoms
  7. 13. a bond in which atoms share electrons