Across
- 6. makes it hard for charges to go through
- 7. rate of flow of charge
- 8. movement energy
- 10. an atom with a charge
- 11. unit is joules
Down
- 1. time it takes for half of the radioactive material to decay
- 2. caused by unstable nucleus
- 3. pulls us towards earth
- 4. units is volts
- 5. spped with direction
- 9. the same atom with different number of neutrons