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