The Periodic table

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Across
  1. 2. The element with an atomic mass of 83.80 (in group 8)
  2. 5. Name of the group at the end of the p.t. (group 8)
  3. 6. The name of the element with the symbol Na
  4. 7. The unique number associated with a specific element
  5. 8. The element that diamonds (and coal!) is made from
  6. 11. The element with an atomic number of 33
  7. 13. Most elements are this type of atom
  8. 14. Name of group 7 atoms
Down
  1. 1. The one or two-letter short version of an Element name
  2. 3. The element that has the symbol Au
  3. 4. The symbol for Radon
  4. 7. The mass of an element (the larger number on the p.t.)
  5. 9. The smallest functional unit that makes up matter
  6. 10. The chemical symbol for Calcium
  7. 12. The name given to specific atoms
  8. 15. One of the elements we breathe in