Elements

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