Periodic table crossword

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Across
  1. 2. the strongest metal
  2. 4. when two elements share an electron
  3. 5. the main metal used in wires
  4. 8. used in armor by knights
  5. 9. when an electron is transferred between electrons
  6. 11. the last element on the periodic table
  7. 13. something that can be positively charged or negatively charged
  8. 15. the first element in the periodic table
  9. 19. the most reactive element
  10. 21. a negatively charged ion
  11. 23. the thing that the world is made up of
  12. 25. used in pencils
  13. 26. the thing you breath
Down
  1. 1. the rarest element
  2. 3. very valuable metal
  3. 6. the name for rows in the periodic table
  4. 7. the chemicals commonly found in pool water
  5. 10. a positively charged ion
  6. 12. the element with the electron configuration 2,8,1
  7. 14. the element with a valence shell of 5
  8. 16. number 10 of the periodic table
  9. 17. the first noble gas in the periodic table
  10. 18. the name for the coloumns
  11. 20. a substance that has metal like properties but is not a metal
  12. 22. the name of the electrons on the most outer layer
  13. 24. the trees breath this in