The Periodic Table

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Across
  1. 3. transition metal used in electric wires
  2. 5. alkali metal present in common salt
  3. 8. main constituent in air
  4. 10. light metal used for aircraft frames
  5. 12. halogen with a reddish color
Down
  1. 1. the lightest element
  2. 2. alkali metal that gives a purple flame
  3. 4. it is used for bleaching
  4. 6. transition metal present in steel
  5. 7. the lightest noble gas
  6. 9. gas inhaled in respiration
  7. 11. halogen present in sea water