Periodic Table

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Across
  1. 4. reacts with water
  2. 5. group 18
  3. 8. radioactive elements
  4. 12. a horizontal row of elements on the periodic table
  5. 13. arranged table by increasing atomic mass
  6. 14. the 6th period
  7. 15. good conductors
Down
  1. 1. atomic # 11
  2. 2. atomic # 12
  3. 3. has chemical reactions with other atoms,#'s 1-8
  4. 6. a vertical column of elements on the periodic table
  5. 7. atomic # 18
  6. 9. group 17
  7. 10. organized table by increasing atomic number
  8. 11. generally gasea or dull, brittle solids