Across
- 4. group 3-12
- 6. element 5,14,32,33,51,52
- 7. what you put in balloons that make them float
- 11. symbol Pr and element 59
- 12. column
- 14. any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table.
Down
- 1. group 1
- 2. group 2
- 3. symbol K
- 5. the horizontal rows of the periodic table
- 8. symbol Fe
- 9. group 18
- 10. first element
- 13. element 57-71