periodic table

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Across
  1. 2. we need this to live
  2. 3. notable applications in X-ray imaging
  3. 4. one of the rarest metals in the word
  4. 6. Its uses in light bulbs and anesthetics, which are lesser-known applications beyond the typical uses of noble gases
Down
  1. 1. the first element on the periodic table
  2. 5. it's a toxic metal that sounds like a planet