Periodic Table

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Across
  1. 3. I am a metal which is liquid at room temperatures
  2. 8. I am an inactive gas
  3. 9. I am the lightest metal with an oxidation number +3 and my symbol B
  4. 10. I am the lightest of all the elements
  5. 11. I am the heaviest of the stable halogens
  6. 13. I was discovered and named by Marie Curie, the mother of radioactivity
  7. 14. I am a poison with the valence electron charge of -3
  8. 16. My atomic mass is 32.064
  9. 17. My most common oxidation state is -2
  10. 21. I am the first element in group 6
  11. 23. I have 26 protons
  12. 24. I am a metal with 28 electrons
  13. 26. I am an alkali metal and you need me to survive, but too much of a good thing is also bad for you
  14. 27. I am an alkaline earth metal and found in your bones
  15. 28. My atomic number is 74
Down
  1. 1. My chemical symbol is C
  2. 2. I am a noble gas from the 5th period
  3. 4. I am extremely radioactive and my mass weight is 238.03
  4. 5. I am an alkaline earth metal and I burn pink!
  5. 6. I am between nickle and zinc on the periodic table
  6. 7. I can make your teeth stronger and I have the electron charge of -1
  7. 10. After hydrogen I am the most abundant element in the universe and I am an alkaline earth metal
  8. 12. I am an alkaline earth metal that is in the 6th period
  9. 15. My chemical symbol is K
  10. 18. I am an inert gas often used in signs
  11. 19. I am a hard, brittle crystalline solid commonly found in many electronic devices and I even have a valley named after me
  12. 20. I am a cation and often found in batteries
  13. 21. I am a halogen often used as a bleaching agent
  14. 22. I am an alkaline earth metal found between calcium and barium
  15. 24. I make up nearly 80% of air and am found in the 15th group
  16. 25. My symbol is Pb
  17. 29. I am a precious metal and my atomic number is 79