Across
- 3. physical substance that takes up space
- 6. the amount an object can hold
- 8. small particle
- 10. mass the mass of an element
- 11. weight
- 12. negatively charged
Down
- 1. number the total number of protos and neutrons in a nucleus
- 2. a positive electric charge
- 4. without an electric charge
- 5. strongly built and holds its shape
- 7. a pure substance consisting of atoms
- 8. number the number of protons of an element
- 9. a matter that expands freely
- 13. a substance that flows freely