Across
- 4. Outer shell electrons.
- 6. The Group 2 metals, also very reactive.
- 9. Most elements on the periodic table fall into this category.
- 10. Horizontal rows on the periodic table.
- 11. Bottom row; all radioactive.
- 14. The very reactive Group 1 metals.
- 15. Groups 3–12; shiny, conductors, wide range of properties.
Down
- 1. Along the zig-zag line; have properties of metals and nonmetals.
- 2. Group 17; salt-formers, very reactive.
- 3. Energy levels that hold electrons; increase as you go down rows.
- 5. These elements are found on the far right side of the table.
- 7. Stands alone at the top, not really part of Group 1.
- 8. Vertical columns on the periodic table.
- 12. Group 18; unreactive gases.
- 13. Top of the bottom two rows; shiny and reactive.