Across
- 2. the measurement energy is measured in
- 6. it contains protons and neutrons
- 7. the movement force
- 9. something passed on through e.g microwaves and lights
- 11. the speed/time it takes half an radioactive material to decay
- 12. 1'000'000
Down
- 1. same element with different numbers of neutrons
- 3. heat transfer in solids
- 4. particles tightly packedtogeather
- 5. the rate how fast something is
- 8. unit in current
- 10. elements that have unstable atoms