Element crossword

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Across
  1. 3. A reactive alkali metal.
  2. 6. The lightest chemical element.
  3. 7. The basis of organic life.
  4. 10. A common metal, susceptible to rust.
Down
  1. 1. Mineral important for strong bones.
  2. 2. A precious, yellow metal.
  3. 4. Essential for breathing.
  4. 5. A reddish-brown metal, good conductor.
  5. 8. Abundant gas in Earth's atmosphere.
  6. 9. A precious, white metal.