Across
- 3. representation of a person or thing
- 4. a physical substance in general
- 5. consistent throughout
- 6. a stable subatomic particle with a charge of negative electricity
- 9. a substance made by mixing other substances together.
- 10. a subatomic particle with a positive electrical charge
- 11. a thing that is composed of two or more separate elements
- 12. a substance made up of only one type of atom
Down
- 1. basic unit of matter
- 2. consisting of dissimilar or diverse parts
- 7. a particular kind of matter with uniform properties.
- 8. a subatomic particle without an electric charge
- 10. not mixed with any substance