Across
- 4. negative subatomic particle.
- 5. vertical columns on the periodic table.
- 8. The elements that are in between the zigzag line on the periodic table.
- 9. To be unreactive with other elements.
- 11. number of protons and neutrons.
Down
- 1. the electrons in the outermost energy level.
- 2. The elements that are on the far upper right corner of the periodic table.
- 3. Name of metals in group 3-12 that have many useful properties.
- 6. Elements in group 17.
- 7. Elements in group 18, very unreactive.
- 10. horizontal rows on the periodic table.
- 12. number number of protons in an element.