Periodic Table Crossword Puzzle

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Across
  1. 4. What element is often found in public pools?
  2. 7. What element is the Earth's most abundant metal?
  3. 10. What element has 18 protons?
  4. 11. What element has the symbol S?
  5. 12. What element has the atomic number 12?
  6. 14. What element is found in bananas?
  7. 17. What is the lightest element?
  8. 18. What element is used to fill balloons?
  9. 19. What element do we need to breathe?
  10. 20. What element has an atomic mass of 10.81?
Down
  1. 1. What element has an atomic mass of 30.97376?
  2. 2. What element is used to season food?
  3. 3. What element has the symbol Be?
  4. 5. What element is found in bones?
  5. 6. What element has 3 protons?
  6. 8. What element has an atomic mass of 18.998?
  7. 9. What element are life forms based on?
  8. 13. What element makes up 78% of the Earth's atmosphere?
  9. 15. What element is found in sand?
  10. 16. What element has 10 protons?