Periodic Table Puzzle

2. I am the only element in the halogen family that is a liquid.
3. I have 20 neutrons and am found in your teeth and bones.
5. I am the first element in the fourth period used in making fertilizer.
10. I have 2 electrons in the first ring, 8 electrons in the second ring, and 6 electrons in the third ring.
11. My atomic # is 47 and I am used to make photographic film.
12. My atomic mass is 35.453.
14. I am the head of the Carbon family known as the "basis of life".
16. I am a gas with 8 protons and 8 neutrons.
18. I am a noble gas with 2 electrons.
19. I am a metal with 28 electrons.
20. I am a member of the Carbon family often mistaken for the end of your pencil.
21. I am a gas with a mass # of 19.

1. I am a transition metal with 25 electrons.
4. You can find me in the Carbon family in the fifth period.
5. I am a member of the nitrogen Family with 16 neutrons.
6. I am not really an alkali metal, but since I have only 1 electron I behave like them.
7. I have 26 Protons.
8. I am a transition metal with 30 electrons useful in making paint.
9. I am a metal that is liquid at room temperature.
13. I am a member of the Halogen family with an atomic # of 53.
15. My atomic # is 79.
17. I make up 78% of Air and am found in the 15th group.