Periodic Table Puzzle

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Across
  1. 2. I am the only element in the halogen family that is a liquid.
  2. 3. I have 20 neutrons and am found in your teeth and bones.
  3. 5. I am the first element in the fourth period used in making fertilizer.
  4. 10. I have 2 electrons in the first ring, 8 electrons in the second ring, and 6 electrons in the third ring.
  5. 11. My atomic # is 47 and I am used to make photographic film.
  6. 12. My atomic mass is 35.453.
  7. 14. I am the head of the Carbon family known as the "basis of life".
  8. 16. I am a gas with 8 protons and 8 neutrons.
  9. 18. I am a noble gas with 2 electrons.
  10. 19. I am a metal with 28 electrons.
  11. 20. I am a member of the Carbon family often mistaken for the end of your pencil.
  12. 21. I am a gas with a mass # of 19.
Down
  1. 1. I am a transition metal with 25 electrons.
  2. 4. You can find me in the Carbon family in the fifth period.
  3. 5. I am a member of the nitrogen Family with 16 neutrons.
  4. 6. I am not really an alkali metal, but since I have only 1 electron I behave like them.
  5. 7. I have 26 Protons.
  6. 8. I am a transition metal with 30 electrons useful in making paint.
  7. 9. I am a metal that is liquid at room temperature.
  8. 13. I am a member of the Halogen family with an atomic # of 53.
  9. 15. My atomic # is 79.
  10. 17. I make up 78% of Air and am found in the 15th group.