The Periodic Table

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Across
  1. 4. has an atomic number of 40
  2. 6. has 9 electrons
  3. 8. has 55 electrons
  4. 11. has 17 electrons
  5. 14. has 2 protons
  6. 15. has 75 protons
  7. 18. has 38 protons
  8. 19. has a mass of 51
  9. 21. has 48 protons
  10. 23. has an atomic number of 18
  11. 24. has 30 electrons
  12. 25. has an atomic number of 52
  13. 26. has 50 neutrons and a mass of 89
Down
  1. 1. has 21 protons
  2. 2. has 81 neutrons and a mass of 137
  3. 3. has 74 neutrons and a mass of 127
  4. 5. has a mass of 7
  5. 7. has an atomic number of 4
  6. 9. has 45 neutrons and a mass of 79
  7. 10. has 55 neutrons and a mass of 98
  8. 12. has 15 protons
  9. 13. has 45 protons
  10. 16. has an atomic number of 31
  11. 17. has a mass of 106
  12. 20. has an atomic number of 72
  13. 22. has 108 neutrons and a mass of 181