Periodic Table Review

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Across
  1. 1. potassium is found in this "block" of the periodic table
  2. 3. most reactive group
  3. 7. properties of both metals and nonmetals
  4. 10. positively charged ion
  5. 12. most unreactive group on the periodic table
  6. 13. most electronegative element
  7. 15. one valence electron in the 2nd energy level
  8. 16. the lanthanoids and actinoids are found in this block
  9. 18. credited for first periodic table
  10. 19. the classification, or type of element, of sodium
  11. 21. number of valence electrons for carbon
Down
  1. 2. 2nd most reactive element, after francium
  2. 4. negatively charged ion
  3. 5. includes all "d block" elements
  4. 6. a positively charged subatomic particle
  5. 8. name means "salt former"
  6. 9. 2 valence electrons in the 4th energy level
  7. 11. 8 valence electrons in the 5th energy level
  8. 14. stable(unreactive) with 2 valence electrons
  9. 16. most reactive element
  10. 17. number of total electrons for oxygen when it becomes an ion
  11. 20. number of total electrons when lithium becomes an ion