Periodic Table Crossword

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Across
  1. 3. reflects nearly 70% of visible light
  2. 6. it has 86 protons
  3. 7. group 2, period 6
  4. 10. beside chlorine on the periodic table
  5. 12. used to make poison
  6. 14. discovered in 1937
  7. 17. has an atomic mass of 257
  8. 19. related to oxygen
  9. 20. beside calcium on the periodic table
  10. 22. has an atomic mass of 19
  11. 23. a heavy, bluish-white metal
  12. 25. it glows blue in the dark
  13. 26. it's named after our country
Down
  1. 1. group 9, period 6
  2. 2. beside iron (Fe) on the periodic table
  3. 4. beside technetium on the periodic table
  4. 5. the 4th element in group 16
  5. 8. has a boiling point of 5,181.8 degrees fahrenheit
  6. 9. has 35 protons
  7. 11. has an atomic mass of 55
  8. 13. has an atomic # of 111
  9. 15. has an atomic mass of 184
  10. 16. a planet is in the name
  11. 18. the 2nd lanthanide
  12. 21. has a reddish-metallic coloring
  13. 24. known mostly to be in milk