Periodic Table Puzzle

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Across
  1. 6. I am a member of the halide family with an atomic number of 53.
  2. 7. I am a gas with 8 protons and 8 neutrons.
  3. 8. I have 26 protons.
  4. 9. I am a noble gas that easily floats in the air.
  5. 13. I am a transition metal with 25 electrons.
  6. 15. My atomic number is 79.
  7. 16. I am the only element in the halide family that is a liquid.
  8. 19. My atomic number is 47 and I am used to make photographic film.
  9. 20. I make up 78% of the air and am found in the 15th group.
  10. 21. I have 20 neutrons and am found in your teeth and bones.
  11. 23. I am the second most abundant element in the earth's crust and have 14 neutrons.
  12. 25. I am a metal that is liquid at room temperature.
  13. 26. I have 2 electrons in the first shell, 8 in the second, and 6 in the third.
Down
  1. 1. I am an element with 6 protons that actually makes up the end of your pencil.
  2. 2. I am a gas with a mass of 19 and am the most reactive non-metal.
  3. 3. I am a member of the Nitrogen family with 16 neutrons.
  4. 4. I am a silvery white metal used to make salt.
  5. 5. I am not really an alkali metal, but since I have only 1 electron I behave like them.
  6. 10. I am an alkaline earth metal used to make fireworks and medicines.
  7. 11. My atomic mass is 35.453.
  8. 12. I am a member of the Carbon family often mistaken for the end of your pencil.
  9. 14. I am a member of the Boron family and am the most abundant metal in the Earth's crust.
  10. 17. I am a transition metal with 30 electrons and am used in making paint.
  11. 18. I am the first element in the fourth period.
  12. 22. I am found in the Carbon family in period five.
  13. 24. I am a metal with 28 electrons.