The Periodic Table

123456789101112131415161718192021
Across
  1. 3. Mercury and _______ are the only elements that are liquid at room temperature.
  2. 5. Group 14.
  3. 9. Diamond and graphite are ____________ of carbon.
  4. 10. Group 15.
  5. 11. Group 2.
  6. 12. Elements having properties of both metals and nonmetals.
  7. 13. The columns in the PT.
  8. 14. Group 17.
  9. 16. Developed the first successful Periodic Table.
  10. 18. The rows in the PT.
  11. 19. Number of elements that are a gas at room temperature.
  12. 20. Group 1.
  13. 21. Separates the metals from the nonmetals.
Down
  1. 1. Group 16.
  2. 2. Group 13.
  3. 4. Two rows usually shown beneath the PT.
  4. 6. Groups 3-12.
  5. 7. _____________ are lustrous, malleable, and ductile.
  6. 8. __________ are not good conductors of heat and electricity.
  7. 15. Group 18.
  8. 17. Elements that exist in nature as two atoms of the same element bonded together are called __________ elements.