Periodic Table

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Across
  1. 2. Element referred to as "basis of life"
  2. 6. Atomic number is 79
  3. 8. Often mistaken for what's in pencils (Grp 14)
  4. 12. Silvery white metal used to make salt
  5. 13. Used in making photographic film (Grp 11, Per 5)
  6. 14. A gas with 8 protons and 8 neutrons
  7. 15. 2nd most abundant metal in Earth's crust (Grp 14)
  8. 17. Exists as a gas with a mass# = 19
  9. 21. Halogen in period 5
  10. 22. Makes of 78% of breathable air, Grp 15
  11. 23. Noble Gas with only two valence electrons
  12. 25. Transition metal that is liquid at room temperature
Down
  1. 1. 2nd most abundant element in body (Grp 15)
  2. 3. Most abundant "poor" metal in the Earth's crust
  3. 4. 2 electrons in 1st shell, 8 in the 2nd, 6 in the 3rd
  4. 5. I'm not an alkali metal but I behave like one
  5. 7. First element in the 4th period
  6. 9. I'm a metal with 28 electrons
  7. 10. Element found in both teeth and bones (20 neutrons)
  8. 11. Alkaline Earth Metal used in fireworks to make red
  9. 16. Element in Group 14, 5th Period
  10. 18. I have 26 protons
  11. 19. My atomic mass is 35.453
  12. 20. Transition metal used to make paint (Grp 12, Per 4)
  13. 24. Only Halogen that is a liquid