Science Project Crossword

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Across
  1. 4. Group 8, Period 4
  2. 5. This atom has 27 protons
  3. 6. Atomic number is 86
  4. 7. Group 14, Period 4
  5. 8. Contains 1 proton
  6. 9. This atom has 82 protons
  7. 12. What do all atoms in a period have in common?
  8. 13. It's atomic symbol is O
  9. 14. Group 2, Period 4
  10. 17. What do all groups of atoms have in common?
  11. 18. It's atomic number is 92
  12. 19. Group 12, Period 6
  13. 20. Atomic symbol is Au
  14. 22. Group 1, Period 2
  15. 23. Group 1, Family 3
Down
  1. 1. Atomic mass of 4
  2. 2. Atomic number of 10
  3. 3. This atom has 56 protons
  4. 7. What group holds the noble gases?
  5. 10. Atomic symbol is As
  6. 11. Group 13, Period 2
  7. 14. Atomic number is 24
  8. 15. What period of atoms has two outer shells?
  9. 16. Atomic mass is a little over 9
  10. 21. Atomic symbol is Sn