the periodic table

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Across
  1. 3. how many groups are in the periodic table?
  2. 5. what element has the destiny of 7.1?
  3. 7. what element has the atomic number of 92
  4. 8. how many periods are in the periodic table?
  5. 10. what element has the symbol Er?
  6. 12. another word for atomic mass unit?
  7. 13. what element is the lightest on the periodic table?
  8. 14. what element has the symbol Fe?
  9. 15. what element is found in pencils?
Down
  1. 1. symbol for lithium?
  2. 2. what element is in group 2 period 2?
  3. 4. what element has the symbol Ag?
  4. 6. what element has the atomic number of 76
  5. 9. what element has an atomic mass of 20.2?
  6. 11. what element has the rounded atomic mass of 55?