Peter's Periodic table Crossword

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Across
  1. 5. A non-metal that is vital for respiration
  2. 6. Second place in the Olympics
  3. 7. A group 7 element with the symbol Br
  4. 10. A light gas that goes into children's balloons
  5. 11. A group 1 metal with the symbol K
  6. 13. Metal more expensive that gold
  7. 15. The lightest of the group 7 elements
  8. 17. The element with atomic number 11
Down
  1. 1. A poisonous gas used to treat swimming pools
  2. 2. Hugely weakens aluminium
  3. 3. The lightest element
  4. 4. A soft metal with the symbol Pb
  5. 7. The element with atomic mass of 10.8
  6. 8. The element with atomic number 7
  7. 9. A transition metal used for storing food. A(blank) can
  8. 12. A non metal that coal and diamonds are made of this
  9. 14. A transition element that is contained in ferrous metals
  10. 16. A Group 1 metal used in high capacity batteries