Across
- 3. process by which an unstable atomic nucleus loses energy by radiation
- 5. no mass or charge
- 6. emitted from the nucleus
- 10. nucleus splitting into 2
- 11. nuclide that has excess nuclear energy, making it unstable
- 13. has neutral charge
Down
- 1. particle emitted when neutron split a proton and electron
- 2. time it takes for half of it to decay
- 4. proton number of a chemical element
- 7. combining of 2 nuclei
- 8. magnesium has 12 of them
- 9. protons and neutrons added together
- 12. two or more forms of the same chemical element