Across
- 5. noble gas used in some bright signs
- 8. element that gives bananas their potassium.
- 10. radioactive element used in nuclear reactors, symbol "U."
- 11. heaviest naturally occurring noble gas
- 12. only metal that is liquid at room temperature
- 13. gas makes up about 78% of the earth's atmosphere
- 14. first element in Group 2 of the periodic table
Down
- 1. element with the symbol "Fe"
- 2. element with the atomic number 79, often used in jewelry
- 3. halogen with the symbol "Cl."
- 4. element's symbol is "Pb" and used in old pipes
- 6. The most abundant metal in earth's crust
- 7. element that diamonds are made of
- 9. lightest element in the universe