Element crossword puzzle

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Across
  1. 2. its atomic mass is 207.2
  2. 4. its sign is Hg
  3. 5. its atomic number 27
  4. 9. the first element on the periodic table
  5. 11. its sign is Au
  6. 12. the second noble gas on the periodic table
  7. 16. its atomic mass is 15.999
  8. 17. its the second element on the periodic table
  9. 18. its sign is Fe
  10. 21. its atomic mass is 137.328
  11. 22. its sign is Na
  12. 23. its the third element on the periodic table
  13. 24. is sign is S
Down
  1. 1. its sign is ti
  2. 3. it located in the 4th row 10th column
  3. 6. the third noble gas
  4. 7. the fifth noble gas
  5. 8. its sign cr
  6. 10. its atomic is 53
  7. 13. its atomic number is 33
  8. 14. its sign is Rh
  9. 15. its atomic number is 50
  10. 19. the last element on the periodic table
  11. 20. its atomic mass is 222