Atomic structure

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Across
  1. 2. an element with atomic mass of 137 approx
  2. 4. one of the elements that does not have an atomic mass on our period table
  3. 8. a element whose name starts with the 9th letter of the alphabet
  4. 10. an atom that has 9 electrons and 10 neutrons
  5. 12. an element that has an atomic mass of 137.33
  6. 13. the number of neutrons in phosporus
  7. 14. the number of neutrons in Argon
  8. 17. an atom with 30 electrons
  9. 18. an element whose symbol includes an i
  10. 20. an element that has an atomic mass of approx.. 9
  11. 21. the element with the largest atomic mass
  12. 24. an atom with 12 neutrons and 12 electons
  13. 25. an atom that has 10 neutrons
  14. 26. an atom that has atomic number of 8
Down
  1. 1. an atomic with 14 neutrons
  2. 2. an element that has an atomic number between 4 and 6
  3. 3. an element with 1 proton
  4. 5. the element whose name starts with the 21st letter of the alphabet
  5. 6. an element with 50 electrons
  6. 7. an atom that has 20 neutrons
  7. 9. an element that has W as its symbol
  8. 10. an atom that has 7 neutrons
  9. 11. an element that has Sb as its symbol
  10. 15. an atom with an atomic mass that has the number 45 in it
  11. 16. an element with 1 electron
  12. 19. an atom with 12 neutrons
  13. 22. an atom with 16 electrons and 16 neutrons
  14. 23. an atom that has 6 protons