Across
- 2. Mineral in bananas (9)
- 4. It's always number one (8)
- 5. Bone-building element (7)
- 9. Swimming pool additive (8)
- 10. Bronze beater (6)
- 12. Fissionable material (7)
- 13. Roughly 21% of the atmosphere (6)
- 14. Type of foil (3)
Down
- 1. Scientific discovery of 1868 (6)
- 3. Before Iron on the periodic table (9)
- 6. 7th wedding anniversary gift (6)
- 7. Metal in some catalytic converters (8)
- 8. Alchemist's goal (4)
- 9. Element used in dating rocks (6)
- 11. Superman's home (7)