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Gold-201 undergoes beta- decay, with a half-life of 26 minutes to Mercury-201 ...

79201Au --> 80201Hg + -10e + v-e

emitting an electron and an electron antineutrino.

Remember: Beta- decay involves changing a neutron into a proton, so the atomic number goes up by one, while the atomic mass number stays the same.

Specifically, a down quark is changed into an up quark, resulting in the change of the neutron into a proton and in the emission of a W- boson, via the weak atomic force, that subsequently decays into an electron and an electron antineutrino.

Memorize this - don't just read it - say it out loud ten times, or whatever works for you.

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