Which represents the balanced nuclear equation for the beta minus decay of Co - 60 ?

In beta minus decay, a neutron changes into a proton and emits an electron. The mass number stays 60, while the atomic number increases from 27 to 28, so cobalt-60 becomes nickel-60 and releases a beta particle: ⁶⁰₂₇Co → ⁶⁰₂₈Ni + ⁰₋₁e. This is choice B.

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