Across
- 2. 2 protons and neutrons bound together
- 4. No electric charge
- 6. produced when radioactive elements decay
- 7. one or more forms of an element
- 9. nucleus of an atom splits
- 10. Total protons and neutrons in a nucleus
- 12. one-half of the radioactive isotope to decay
Down
- 1. radioactive atom such as hydrogen-3
- 3. high speed high energy electrons
- 5. Positive charge
- 8. Protons in the nucleus of an atom
- 9. atomic nuclei combine
- 11. the act of emitting radiation spontaneously