Periodic Table Crossword

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Across
  1. 2. I am expensive
  2. 3. Group 11 period 5
  3. 4. Group 9 period 7
  4. 7. I am put into balloons
  5. 9. Mg
  6. 11. You need me to breath
  7. 15. I have 14 neutrons
  8. 16. I have 118 electrons
  9. 18. I have 58 protons
  10. 22. My atomic number is 80
  11. 23. I have 7 neutrons
Down
  1. 1. Co
  2. 3. Se
  3. 5. Group 14 period 3
  4. 6. Er
  5. 8. Group 5 period 6
  6. 10. I have 5 neutrons
  7. 12. I have 10 neutrons
  8. 13. I am in orange juice
  9. 14. I have 16 protons
  10. 17. I have 29 protons
  11. 19. I am a type of coin
  12. 20. I am the first element in group 3
  13. 21. Xe