Periodic Table

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Across
  1. 5. size of ion
  2. 8. ions of these elements are colored
  3. 11. size of neutral atom
  4. 12. elements in same period have same # of these occupied
  5. 13. halogens don't occur by themselves, therefore they are this
  6. 14. first periodic table was based off of this
  7. 16. same number of e- / configuration
  8. 18. modern table is based on this
  9. 19. repeats at regular intervals
Down
  1. 1. most reactive nonmetals
  2. 2. horizontal rows are called this
  3. 3. extremely stable group
  4. 4. energy needed to pull electron from neutral gaseous atom
  5. 6. properties of both metals and nonmetals
  6. 7. elements higher than #92 are this
  7. 9. father of modern table
  8. 10. few valence e- and low ionization energy
  9. 15. vertical columns are called this
  10. 17. measure of attraction of nucleus for bonded e-
  11. 18. most reactive metals