Across
- 4. Particles with two protons + two neutrons
- 8. Natural radiation in the environment
- 10. Number of decays per second
- 11. Atom with lost electron
- 13. Negative particle
- 14. Charge on atoms
Down
- 1. Protons and neutrons found here
- 2. Number of protons in a nucleus
- 3. Atoms each with same number of protons
- 5. Gas with one proton in nucleus
- 6. Time for half the atoms to decay
- 7. Total number of protons and neutrons
- 9. High energy electromagnetic radiation
- 12. particle with positive charge