Elements of the Periodic Table

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Across
  1. 1. - Precious metal in jewelry
  2. 4. - Makes up the majority of Earth's atmosphere
  3. 6. - Basis of organic chemistry
  4. 9. - Used in computer chips
  5. 12. - The lightest element
  6. 13. - Used in nuclear reactors
Down
  1. 2. - Historically used in pipes
  2. 3. - Only metal that's liquid at room temperature
  3. 5. - Found in steel
  4. 6. - Used in water purification
  5. 7. - Essential for human respiration
  6. 8. - Valuable precious metal
  7. 10. - Reacts explosively with water
  8. 11. - Noble gas in neon signs
  9. 12. - Used in party balloons