Periodic Table Puzzle

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