Element Crossword Puzzle

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Across
  1. 1. I am found in group 12 in period 6
  2. 3. My chemical symbol is Sn
  3. 5. I have 161 neutrons
  4. 9. I am a very high thermal and electrical conductive metal
  5. 12. My chemical symbol is Nb
  6. 16. I am a transition metal and am the most common element on Earth
  7. 17. I am a heavy metal that is often mistaken for the tip of a pencil
  8. 18. My chemical symbol is W
  9. 19. I am found in group 18 in period 1
  10. 20. My chemical symbol is Eu
  11. 21. I have 28 neutrons
  12. 22. I have 157 neutrons
  13. 23. My atomic number is 76
Down
  1. 2. I Have 39 protons
  2. 4. My atomic number is 10
  3. 6. My atomic number is 75
  4. 7. I am found in group 5 in period 4
  5. 8. I am found in group 9 in period 6
  6. 10. I have 8 neutrons
  7. 11. I have 208.98 protons
  8. 13. My chemical symbol is K
  9. 14. I am a highly toxic pale yellow gas that is highly reactive
  10. 15. I have 108 protons
  11. 19. My atomic number is 67