Across
- 4. number (atomic number) The number of protons in the nucleus
- 6. equation An equation showing radioactive decay
- 7. decay The process where an unstable nucleus changes and emits radiation
- 11. number The total number of protons and neutrons
- 12. radiation High-energy electromagnetic radiation
Down
- 1. Atoms of the same element with different numbers of neutrons
- 2. particle A fast-moving electron emitted from the nucleus
- 3. power The ability of radiation to pass through materials
- 5. The centre of an atom containing protons and neutrons
- 8. particle A particle made of 2 protons and 2 neutrons
- 9. radiation Radiation capable of removing electrons from atoms
- 10. The time taken for half of the radioactive nuclei in a sample to decay