Periodic table of elements crossword

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Across
  1. 2. I'm in group 14 period 2
  2. 5. My chemical symbol is Se
  3. 7. My chemical symbol is Nh
  4. 8. Ds is its chemical symbol
  5. 10. in group 8 period 6
  6. 11. what is the name of the columns on the periodic
  7. 13. my chemical symbol is Rn
  8. 15. A negative part of an atom
  9. 16. I have 77 neutrons and in period 18
  10. 19. my chemical symbol is Ag
  11. 21. I have 30 neutrons and in group 8
  12. 22. elements
  13. 24. I'm in group 9 period 7
  14. 25. I have 25 protons
  15. 26. I have 7 electrons
Down
  1. 1. of elements
  2. 3. I have 4 protons
  3. 4. P is its chemical symbol
  4. 6. My chemical symbol is Cd
  5. 9. I have 110 neutrons and in group 6
  6. 12. Im in group 18 and period 3
  7. 14. I have 117 neutrons and in group 17
  8. 17. what is the name of the rows on the periodic table
  9. 18. Rb is its chemical symbol
  10. 20. I have 44 protons
  11. 23. A positive part of an atom