Across
- 2. A positively charged particle made of two protons and two neutrons.
- 3. Occurring unpredictably, with no fixed pattern or timing.
- 5. Unwanted radioactive material on or inside an object or body.
- 7. A random and spontaneous nuclear transformation releasing radiation.
- 10. Radiation that is always present in the environment.
- 13. A specific type of nucleus defined by its numbers of protons and neutrons.
- 15. Having unstable nuclei that emit radiation to become more stable.
- 17. A neutral particle found in the nucleus of an atom.
- 18. A positively charged particle found in the nucleus of an atom.
Down
- 1. Happening without any external cause or trigger.
- 4. The change of an unstable nucleus into a more stable one.
- 6. The number of nuclear decays per second of a radioactive source.
- 8. The process of forming charged particles by gaining or losing electrons.
- 9. The dense central part of an atom containing protons and neutrons.
- 11. High-energy electromagnetic radiation emitted from the nucleus.
- 12. A fast-moving electron emitted from an unstable nucleus.
- 14. Energy or particles emitted from a radioactive source.
- 16. Atoms of the same element with different numbers of neutrons.