Year 9 Radiation
Across
- 1. Different forms of an element with different numbers of neutrons.
- 5. Central core of an atom.
- 6. When an unstable nucleus releases a particle.
- 8. Particle that has poor penetrating power.
- 11. A radioactive isotope.
- 13. The basic unit of matter.
- 14. Atom that has gained or lost electrons.
- 15. Used to detect radiation.
- 16. The number of protons in an atom.
- 18. The time taken for a radioisotope to decay half of its original mass.
Down
- 2. Charge of the nucleus.
- 3. First name of the lady who is famous for her work with Radium.
- 4. The most penetrating of the three forms of radiation.
- 7. A small negatively charged particle.
- 9. The city in Japan where the first atomic bomb was dropped.
- 10. When alpha, beta or gamma radiation are emitted.
- 12. An unstable element.
- 17. Particle that travels at very high speeds with moderate penetrating properties.