Across
- 2. a chemical element is the number of P
- 5. the first letter of the Greek alphabet
- 7. atoms that have the same atomic number PTOE
- 9. the second letter of the Greek alphabet
- 10. the nucleus of atom spits into small nuclei
- 12. unstable atomic nucleus energy loss
- 13. form of electricity by using heat
Down
- 1. the third letter of the Greek alphabet
- 3. a radioactive isotope
- 4. subatomic particle without electric charge
- 6. time it takes for radioisotope to decay
- 8. subatomic particle with a + electric charge
- 11. the total number of P and N in the nucleus