Periodic Table Puzzle

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123456789101112131415
Across
  1. 5. atomic mass 107.868
  2. 7. symbol is Fe
  3. 9. atomic number 3
  4. 11. atomic number 11
  5. 12. symbol is Au
  6. 14. atomic number 54
Down
  1. 1. atomic number 5
  2. 2. atomic number 29
  3. 3. atomic mass 54.938
  4. 4. atomic mass 47.867
  5. 6. symbol is Si
  6. 8. atomic number 1
  7. 10. symbol is Mg
  8. 13. symbol is Sn
  9. 15. atomic mass 15.999