Chemistry Crossword

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Across
  1. 2. the gas that makes up most of Earth's atmosphere
  2. 6. a soft metal often used in rechargeable batteries
  3. 7. a noble gas with the symbol He
  4. 9. the gas many living things use during respiration
  5. 11. an element found in DNA and bones
  6. 15. a reactive metal with the symbol K
  7. 17. a very reactive halogen with the symbol F
  8. 18. the main element found in many living things
  9. 19. a metal that burns with a bright white flame
  10. 20. a noble gas with the symbol Ne
Down
  1. 1. a soft metal that reacts strongly with water
  2. 3. a yellow nonmetal with the symbol S
  3. 4. a metalloid sometimes used in glass materials
  4. 5. element number 4 on the periodic table
  5. 8. a very light gas with the symbol H
  6. 10. a lightweight metal often used for cans
  7. 12. a metalloid used in computer chips
  8. 13. a metal important for strong bones and teeth
  9. 14. a greenish-yellow halogen with the symbol Cl
  10. 16. a noble gas with the symbol Ar