periodic table puzzle

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Across
  1. 3. odourless, colourless and basically an inert gas. and only accounts for 0.94% by volume of the gasses in the atmosphere
  2. 5. found in streetlights, very rare as a gas
  3. 6. blue and used to make airbags in automobile
  4. 7. Twice as Strong as Aluminum and used in joint replacements, usually for the hips
  5. 9. we need to breath it in order to survive
Down
  1. 1. emitted when halogens are reacting with water
  2. 2. a synthetic element named after the creator of the modern periodic table
  3. 4. second rarest aswell as radioactive,is also used for diagnostics for curing cancers
  4. 8. the most abundant element on earth, is also an essential element in blood production