Electrons and Periodic Table

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Across
  1. 3. Lost electrons
  2. 5. O
  3. 7. One full shell, One half filled shell
  4. 10. 13 protons
  5. 11. Na
  6. 13. 2,8,4
  7. 15. Really want to lose 1 of its 19 electrons
  8. 18. Atomic number 4
  9. 19. Gained electrons
  10. 20. Three shells and would like one more electron to be happy
  11. 21. Two full shells
Down
  1. 1. 2,7
  2. 2. He
  3. 3. Fifteen
  4. 4. Atomic number 12
  5. 6. 7 protons
  6. 8. Unreactive and three shells
  7. 9. Atomic number 20
  8. 12. B
  9. 14. 2,1
  10. 16. Under Oxygen
  11. 17. One proton