Across
- 2. positively charged nucleon
- 4. neutral very low‑mass lepton
- 6. plural of nucleus
- 8. charged atom
- 11. particle meets antiparticle
- 14. decays detected per second
- 15. proton or neutron
- 19. opposite‑charge counterpart
- 21. self‑sustaining process
- 22. same protons different neutrons
- 24. smallest unit of an element
- 25. slows neutrons
- 26. unpredictable timing of decay
- 28. natural environmental radiation
- 30. time for half a sample to decay
- 31. rate of radioactive decay
- 32. unit of activity
- 36. three‑quark hadron
- 38. slow moving particle initiates fission
- 39. happens without external cause
- 40. total protons and neutrons
- 42. atomic number of an atom
- 45. antiparticle of electron
Down
- 1. cannot be broken down
- 3. neutral nucleon
- 5. probability a nucleus decays per second
- 7. process of unstable nuclei emitting radiation
- 9. missing mass of a nucleus
- 10. negatively charged lepton
- 12. specific nucleus defined by numbers
- 13. four fundamental interactions
- 16. enriched fuel for reactors
- 17. photon creates particle pair
- 18. fundamental strong‑interacting particle
- 20. combining light nuclei
- 23. force binding nucleons
- 27. central region of an atom
- 29. number of neutrons
- 33. particle not affected by strong force
- 34. particle experiencing strong force
- 35. age measurement using carbon14
- 36. energy to separate a nucleus
- 37. quark–antiquark hadron
- 41. absorbs neutrons
- 43. splitting heavy nuclei
- 44. exchange particle mediating forces