PERIODIC TRENDS

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Across
  1. 5. nonmetals
  2. 6. left side of stairs
  3. 7. 4s2
  4. 10. outside electrons
  5. 12. gains electrons
  6. 14. halogen molecules
  7. 15. solution
  8. 16. atoms size
  9. 18. to remove electron
  10. 19. group 18
  11. 20. arranged by mass
Down
  1. 1. group 2
  2. 2. solid to gas
  3. 3. desires electrons
  4. 4. gas to liquid
  5. 8. increase by atomic #
  6. 9. brittle and lustrous
  7. 11. group 17
  8. 13. loses electrons
  9. 17. uniform mixture