Periodic Families

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Across
  1. 6. fluorine
  2. 9. outermostshell
  3. 10. columns
Down
  1. 1. unreactive
  2. 2. reacts with halogens
  3. 3. calcuim
  4. 4. Fe
  5. 5. Magnesium
  6. 7. carbon
  7. 8. sulfur