Periodic Table

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Across
  1. 1. He
  2. 6. makes up the periodic table
  3. 8. Al
  4. 9. O
  5. 12. Be
  6. 13. C
  7. 14. N
Down
  1. 2. Li
  2. 3. Mg
  3. 4. H
  4. 5. Na
  5. 7. Electrons that occupy the highest levels in an atom
  6. 10. F
  7. 11. B
  8. 14. Ne