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A radioactive atom X emits a beta-partic...

A radioactive atom `X` emits a `beta-`particle to produce an atom `Y` which then emits an Particle to give an atom `Z`
(1) the atomic number of `X` is less than that of `Z`.
(2) the atomic number of `Y` is less than that of `Z`.
(3) the mass number of `X` is the same as that of `Y`.

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