Across
- 4. element can't be decomposed
- 6. in the form of heat
- 10. smallest unit of matter
- 11. lighter nuclei combine to create heavier nuclei
- 13. material for sports equipment
- 14. 2 or more elements
- 15. cosmological theory
Down
- 1. an example of light element
- 2. pure substance
- 3. air can be an example
- 5. can conduct electricity
- 7. combination
- 8. elements to make electric wires
- 9. heavy element
- 12. death of a star