Periodic table

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Across
  1. 2. we need it to breath
  2. 6. atomic number 3
  3. 7. first place
  4. 8. a hard grey metal
  5. 9. a colourless, odourless unreactive gas
Down
  1. 1. lightest member of the noble gasses
  2. 3. after 7 across in a race
  3. 4. CO2
  4. 5. borax or a non metallic solid