Across
- 2. matter with defined volume but not shape
- 6. particle with no charge in the nucleus
- 8. amount of matter
- 9. same atoms with different numbers of neutrons
- 11. electron energy levels
- 12. particle with positive charge in the nucleus
Down
- 1. matter with defined shape and volume
- 3. measurement of mass per unit volume
- 4. smallest unit of that element that can exist alone
- 5. anything that has mass and takes up space
- 7. negatively charge particle in an atom
- 10. matter with neither defined shape or volume