Periodic Table Crossword

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Across
  1. 5. A yellow-green gas at room temperature
  2. 6. Inert Gas used for lighting
  3. 9. Highest melting point, can be found mainly in 2 forms with a valency of 4.
  4. 10. Period 3 metalloid
  5. 13. Element present in glass and used as a semiconductor
  6. 15. Metal with atomic size 227pm has the Latin name Natrium
  7. 16. A noble gas used for filling balloons and dirigibles
Down
  1. 1. A diatomic molecule, with a valency of 1
  2. 2. A silvery white material, also found in our bones and teeth
  3. 3. I appear in as the last number in an electronic configuration
  4. 4. Most reactive non metal
  5. 7. Metal with valency 1 has a Latin name Kalium
  6. 8. Non-metal with atomic size 188pm and valency 0
  7. 11. The most widely used non ferrous metal
  8. 12. The highest purity of which exists as an amorphous dark brown to black powder
  9. 14. Colourless and odourless gas, 21% of it is in the air