Across
- 2. Group 15 elements
- 4. Forms +3 cations
- 5. Forms allotropes like diamond and graphite
- 8. most reactive metals, has one valence electron\
- 9. Columns of the periodic table
- 11. Most reactive nonmetals
Down
- 1. Forms -2 anions
- 3. The properties of elements repeat periodically
- 6. Beryllium, Magnesium, Calcium..
- 7. Rows on the periodic Table
- 10. Inert elements with a filled outer shell of electrons