Across
- 3. what the periodic table is named
- 6. the horizontal lines on the periodic table
- 8. what determines an elements neutrons
- 12. The amount of electrons on the last shell
- 13. the atomic mass of oxygen
- 14. Where the electrons are, just outside of the nucleus
Down
- 1. who created the periodic table
- 2. the least reactive of the elements
- 4. majority of the periodic table
- 5. The vertical lines on the periodic table
- 7. the most reactant halogen
- 9. the elements found on the staircase on the periodic table
- 10. what determines protons and electrons
- 11. what is the atomic symbol for Iron