Across
- 2. letter of the greek alphabet.
- 4. with a positive charge.
- 6. atomic particles loosing energy.
- 9. with a negative charge.
- 11. 235.
- 12. letter of the greek alphabet.
- 13. of heavy unstable nucleus into two lighter nuclei.
Down
- 1. of two light nuclei combined together releasing energy.
- 3. species of the same chemical element with different masses.
- 5. equal the number of electrons in orbit with the nucleus.
- 7. number.
- 8. second letter in the greek alphabet.
- 10. from uranium.