Across
- 4. reacts with water
- 5. group 18
- 8. radioactive elements
- 12. a horizontal row of elements on the periodic table
- 13. arranged table by increasing atomic mass
- 14. the 6th period
- 15. good conductors
Down
- 1. atomic # 11
- 2. atomic # 12
- 3. has chemical reactions with other atoms,#'s 1-8
- 6. a vertical column of elements on the periodic table
- 7. atomic # 18
- 9. group 17
- 10. organized table by increasing atomic number
- 11. generally gasea or dull, brittle solids