A nucleus will be unstable if it has:
- too many neutrons/too few neutrons
- if its too heavy eg. to many protons and neutrons together
- too much energy
β - ) decay happens when there are too many neutrons, the proton number decreases by one, and the nucleon number stays the same.
β + ) decay happens when there are too few neutrons, the proton number decreases by one, and the nucleon number stays the same.
α ) decay happens in heavy nuclei, the proton number decreases by two, and the nucleon number decreases by four.
γ ) is emitted from a nuclei with too much energy.
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