periodic table review

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Across
  1. 3. too big to fit
  2. 4. Sad energy
  3. 5. bad coductivity
  4. 9. very angry elements
  5. 10. up and down
  6. 12. radioactive
  7. 15. almost as angry as alkaline metals
  8. 16. location of most of the mass
  9. 17. Happy elements
  10. 18. Happy energy
  11. 19. really wants to be happy
  12. 20. different element versions
Down
  1. 1. silicon valley
  2. 2. left and right
  3. 6. Russian chemist
  4. 7. Big group of elements
  5. 8. average weight of element
  6. 11. shiny and conductive
  7. 13. charged atom
  8. 14. elements identitiy