Joshua Joyner's crossword

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Across
  1. 3. The simplest unit of a chemical compound
  2. 6. The name for a gas which absorbs infrared radiation
  3. 7. A reaction that takes in heat
  4. 8. The scientific name for burning
  5. 9. The result of corrosion
  6. 10. The term for the three things needed for a fir to burn
  7. 12. An electrically charged atom
  8. 13. A reaction that gives off heat
  9. 16. The basic unit of a chemical element
Down
  1. 1. A gas that takes up 21% of the air
  2. 2. A method to stop rusting
  3. 4. When metals react with air and water
  4. 5. A gas given off when burning
  5. 11. A gas that takes up 78% of the air
  6. 14. Multiple elements not chemically joined together
  7. 15. Multiple elements chemically joined together