Which Element Am I?

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Across
  1. 2. Mass Number = 13,neutrons= 8
  2. 5. Chemical Symbol is K
  3. 8. Mass Number = 18, and 10 neutrons
  4. 9. Has 18 Protons
  5. 12. Has 37 Neutrons, and mass number 66
  6. 13. Has 18 Neutrons and Mass number 35
  7. 15. mass number 19 and Has 10 Neutrons
  8. 19. Has 14 Neutrons
  9. 20. Has 20 Electrons
  10. 21. Chemical symbol is Mg
Down
  1. 1. Has 11 electrons
  2. 3. Atomic Number = 14
  3. 4. Has 10 protons
  4. 5. Has 15 Electrons
  5. 6. Mass number of 56, 30 neutrons
  6. 7. Has 6 Electrons
  7. 10. Mass Number = 11, neutrons = 7
  8. 11. Atomic Number = 1
  9. 14. Mass number 7 and has 4 Neutrons
  10. 16. has 7 electrons
  11. 17. Chemical Symbol is He
  12. 18. Chemical Symbol is S