Across
- 4. two or more forms of the same element
- 5. a stable subatomic particle with a charge of negative energy
- 8. displays of chemical energy
- 9. an essential or characteristic
- 10. the smallest part of a chemical element that can exist
Down
- 1. a stable subatomic particle occurring in all atomic nuclei
- 2. the emission of energy
- 3. in science a model is a representation of an idea
- 6. the most important part of an object
- 7. a subatomic particle