Across
- 5. The outermost electrons on an atom
- 7. The noble gas with a mass of 222 amu
- 10. The type of earth metal with a low density
- 11. The alkali metal with 11 electrons
- 13. The word for nonreactive
- 14. Form salts when bonding with metals
- 15. The rule for having eight valence electrons
- 17. The type of metal that is the most reactive
- 18. The halogen with 35 protons
Down
- 1. The alkaline earth metal that is good for bones
- 2. The number of valence electrons needed to complete Cl
- 3. The vertical columns on the periodic table
- 4. The name of the metals in the middle of the periodic table
- 6. The type of gas that has a full octet
- 8. The horizontal rows on the periodic table
- 9. The element in period 2 group 18
- 12. The last element in the alkali metal family
- 16. The number of groups on the periodic table