Chemistry.

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Across
  1. 5. – An element found in bones, shells, and teeth
  2. 7. – A compound of chlorine and oxygen
  3. 8. – A bluish-gray metallic element used in alloys
  4. 12. – A compound formed when oxygen combines with another element
  5. 13. – A compound containing aluminum and oxygen
  6. 15. – Found in toothpaste; helps prevent tooth decay
  7. 19. – A compound containing molybdenum and oxygen
Down
  1. 1. – A metallic element used in galvanization
  2. 2. – A heavy metal used in light bulbs and tools
  3. 3. – A salt or ester of acetic acid
  4. 4. – A positively charged polyatomic ion (NH4⁺)
  5. 6. – A compound containing boron and oxygen
  6. 7. – An ion made of carbon, nitrogen, and oxygen
  7. 9. – A salt or ester of formic acid
  8. 10. – A salt containing the perchlorate ion
  9. 11. – A shiny, valuable metal used in jewelry
  10. 14. – An element used in electronics and computer chips
  11. 16. – A compound that contains iodine and oxygen
  12. 17. – A boron compound containing oxygen
  13. 18. – A zinc compound containing oxygen