chemistry crossword

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Across
  1. 8. i am used to blow up balloons
  2. 11. silvery white metal used to make salt
  3. 12. able to kill superman
  4. 14. used for bombs
  5. 15. hydrygen,oxygen are called what
  6. 16. the scientist who came up with atomic theory
  7. 19. table of the what
  8. 20. vertical columns on the periodic table
  9. 21. i am a metalloid used in computer chips
  10. 23. ELEMENTS ARE LISTED ON THE PERIODIC TABLE IN ORDER OF
Down
  1. 1. have both metals and nonmetals
  2. 2. first column of elements is named
  3. 3. not a akali metal but i only have 1 electron and behave like them
  4. 4. * table
  5. 5. only element in the halide family that is a liquid
  6. 6. most electro negative element on the periodic table
  7. 7. i am a metal with 28 electrons
  8. 9. metal that is liquid at room temperature
  9. 10. my atomic number is 79
  10. 13. type of science class
  11. 17. sometimes used as poison
  12. 18. i am a gas with 8 protons & 8 neutrons
  13. 22. i have 26 protons