TicTacToe ChoiceBoard

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Across
  1. 4. has an atomic number of 33
  2. 6. The first element of the periodic table
  3. 9. has the chemical symbol Cu
  4. 10. the first element of the lanthanides period
  5. 11. the 50th element of the periodic table
  6. 12. the only metalloid in group 13
  7. 14. the lightest element of the noble gases
  8. 15. the first element of the Actinides period
  9. 18. has an atomic mass of 107.87
  10. 20. has an atomic mass of 55.847
Down
  1. 1. the 100th element of the periodic table
  2. 2. has an atomic number of 79
  3. 3. the only metalloid in period 3
  4. 5. the first element in period 4
  5. 7. the only nonmetal in period 6
  6. 8. the first metal on the periodic table
  7. 13. the only nonmetal in period 7
  8. 16. has a chemical symbol of W
  9. 17. the only metalloid in group 17
  10. 19. the only nonmetal in period 6