Radiometric dating of sediments
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After emission, it quickly picks up two electrons to balance the two protons, and becomes an electrically neutral helium-4 (He4) atom. When an atom emits a beta particle, a neutron inside the nucleus is transformed to a proton.The mass number doesn't change, but the atomic number goes up by 1.Since all atoms of the same element have the same number of protons, different nuclides of an element differ in the number of neutrons they contain.
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Many nuclides are stable -- they will always remain as they are unless some external force changes them.
The rules are the same in all cases; the assumptions are different for each method.
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