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Answer:  Holmium-165 = Er-165 + electron

Explanation:

Beta decay is the decay of a neutron into a proton and electron.  This will increase the number of protons in the Holmium nucleus by one, making it Er, Erbium, with the same atomic mass.  

Holmium-165 = Er-165 + electron

The mass is essentially the same, as the proton is assigned the same mass as the neutron it came from.

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