Explain that unstable nuclei may emit radiation to become more stable.

Within Mass number, atomic number and isotopes, this learning objective asks you to explain that unstable nuclei may emit radiation to become more stable. Focus on the approved ideas that, unstable, nuclei, emit, radiation and connect them clearly to Atoms and isotopes. A strong response should state the relevant particle, radiation, isotope, decay, half-life or nuclear-equation idea, then explain how it answers the exact command word. Avoid swapping nearby concepts such as atomic number and mass number, isotope and ion, alpha, beta and gamma radiation, or contamination and irradiation.