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