Elements

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Across
  1. 3. Has the symbol Sn.
  2. 4. A poisonous gas combined with Sodium to make table salt.
  3. 6. Has an atomic mass of 12 amu
  4. 8. Elements that have a full outer electron shell.
  5. 10. Has the symbol Pb.
  6. 11. A soft metal found in group 13, period 3.
  7. 13. Mercury is in this state at room temperature.
  8. 15. Is a noble gas found in balloons
  9. 16. Has 9 protons in its nucleus
  10. 18. Has 8 protons and neutrons.
  11. 20. Has the symbol K.
Down
  1. 1. Makes up 78 percent of our atmosphere and has a mass of 14 amu.
  2. 2. The element found in period 4, group 11.
  3. 5. Has the symbol Na, because it was originally called Natrium.
  4. 7. Has the symbol Au.
  5. 9. Most elements on the periodic table are this state at room temp.
  6. 12. Has the symbol Hg.
  7. 14. Has the symbol Fe.
  8. 17. is the lightest metal on the periodic table.
  9. 19. The state of matter of the elements in red.
  10. 21. Has the symbol Ag.