periodic table

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Across
  1. 2. needed to live
  2. 4. atomic number 92
  3. 5. atomic number 22
  4. 7. atomic number 5
  5. 8. The heaviest of the stable halogens
Down
  1. 1. Atomic mass:39.098 u Melting point:63.5°C (336.65 K) Boiling point:758.85°C (1032 K)
  2. 3. it is a metal, the fourteenth and penultimate element in the lanthanide series
  3. 6. It is the second noble gas in the periodic table