To solve this problem, we'll balance the mass numbers on parent nuclide vs the daughter nuclides.

We'll also apply conservation of charges.

e^{-} is a Beta particle. A beta particle has no mass.

${}_{{\mathbf{15}}}{}^{{\mathbf{32}}}\mathbf{P}{\mathbf{\to}}{}_{{\mathbf{b}}}{}^{{\mathbf{a}}}{\mathbf{X}}{\mathbf{+}}{}_{\mathbf{-}\mathbf{1}}{}^{{\mathbf{0}}}{\mathbf{\beta}}$

Identify the unknown isotope X in the following decay.

^{32}P→ X + e^{−}

A. ^{32}S

B. ^{30}P

C. ^{35}Cl

D. ^{31}P

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