Periodic Table Puzzle

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Across
  1. 3. I am in group 14, period 6.
  2. 5. I am in group 18, period 2 and am using to make bright signs.
  3. 8. I have 26 protons.
  4. 9. I have 20 neutrons and am found in your teeth and bones.
  5. 12. My atomic number is 79.
  6. 13. I am a member of the halide family with an atomic number of 53.
  7. 15. I am a gas in group 17 with a mass of 19. I am the most reactive nonmetal.
  8. 19. I am in group 2, period 3 and am used to make fireworks.
  9. 20. I am in group 13, have 14 neutrons, and can be used to make foil.
  10. 23. I am an element with 6 protons that actually makes up the end of your pencil.
  11. 24. I am in group 15 and have 16 neutrons.
  12. 25. I am in group 14, period 4.
  13. 26. I have 7 electrons and make up 78% of the air.
  14. 27. I have 55 electrons and am very explosive when dropped in water.
  15. 28. I have 2 electrons in the first cloud, 8 in the second, and 6 in the third.
Down
  1. 1. I am a noble gas that easily floats in the air, which is why I am used in balloons.
  2. 2. I am not really an alkali metal, but since I only have 1 electron I behave like them.
  3. 4. I am a transition metal with 30 electrons and am used in making paint.
  4. 6. I am a gas with 8 protons and 8 neutrons.
  5. 7. I am in group 13, period 4 and can melt in your hand.
  6. 10. I am the first element in the fourth period.
  7. 11. My atomic number is 47 and I am used to make photographic film.
  8. 14. I am the third element to the right in the Lanthanides row and make some seriously strong magnets.
  9. 16. I am a transition metal with 25 electrons.
  10. 17. I have 98 protons and am named after the state you are currently in.
  11. 18. I have 35 electrons and am a liquid at room temperature.
  12. 21. I am a silvery white metal used to make salt and have a rounded mass of 23.
  13. 22. I have a rounded atomic mass of 35.
  14. 26. I am a metal with 28 electrons.