chemistry crossword

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Across
  1. 7. element number 17
  2. 8. the things on the periodic table
  3. 10. particle with a negative charge
  4. 13. far apart particles
  5. 16. element number 93
  6. 17. the number at the bottom of an element square on a period table is the _______ mass
  7. 18. groups 3-12 are ______ metals
  8. 20. element with differing masses
Down
  1. 1. group 1 contains ______ metals
  2. 2. bond of two nonmetals
  3. 3. period 4, group 2
  4. 4. electrons on the outer shell
  5. 5. packed particles
  6. 6. particle with a positive charge
  7. 9. group 17
  8. 11. fixed volume but not fixed shape
  9. 12. when writing an equation, you use ______ numbers to ensure your compounds are balanced
  10. 14. bond of a metal and a nonmetal
  11. 15. particle with a neutral charge
  12. 19. group 18 are _______ gases