First 20 Elements of The Periodic Table

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Across
  1. 2. atomic number is 5
  2. 4. second most plentiful mineral in your body
  3. 8. found in bleach
  4. 9. atomic number is 4
  5. 11. symbol is K
  6. 12. lightest chemical element
  7. 15. least dense metal
  8. 17. help build bones and keep teeth healthy
  9. 18. helps to regulate Earth's temperature
  10. 19. symbol is Ar
  11. 20. second noble gas in periodic table
Down
  1. 1. atomic number is 16
  2. 3. what we breathe
  3. 5. used to make balloons go up
  4. 6. atomic number is 11
  5. 7. pale yellow diatomic gas
  6. 10. symbol is Mg
  7. 13. most used non-ferrous metal
  8. 14. symbol is Si
  9. 16. lightest member of group 15