Across
- 1. matter that flows freely but has a fixed volume
- 5. subatomic particle with a positive electric charge
- 7. subatomic particle with no electric charge
- 10. wave radiation that is very difficult to stop and passes through almost everything
- 11. subatomic particle with a charge of negative electricity
Down
- 2. a chemical element with a different number of neutrons to its atom
- 3. a chemical element with a different number of electrons to its atom
- 4. particle radiation that is stopped easily as the particles are large
- 6. particle radiation that is not stopped easily as the particles are small
- 8. the smallest particle of a chemical element that can exist
- 9. matter that is stable and firm in shape
- 10. matter that expands to fill an area