Periodic Table Crossword Puzzle

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Across
  1. 4. It's a gas with a mass of 4.00
  2. 7. It's what plants breathe in
  3. 8. Has a negative charge
  4. 9. It's in Group 2
  5. 12. It's in Group 11
  6. 13. Has an Atomic mass of 210
  7. 14. They have a neutral charge
  8. 17. Atomic symbol is N
  9. 18. It's Atomic number is 29
  10. 19. Atomic symbol is Ag
Down
  1. 1. Classifying elements according to their properties
  2. 2. It's Atomic mass is 28.09
  3. 3. It's in Group 16
  4. 4. Its Atomic mass is 1.01
  5. 5. It's a mass of 65.39
  6. 6. Its Atomic number is 56
  7. 10. Atomic symbol is Hg
  8. 11. It's in Bananna and it's in Group 1
  9. 15. Has a mass of 204.38
  10. 16. They have a positive charge