Chemistry

Problem

1. A radioactive oxygen

{ }^{15} \mathrm{O}_{8}

nucleus emits a positron and becomes A)

{ }^{15} \mathrm{~N}_{7}

{ }^{15} \mathrm{O}_{8}

{ }^{14} \mathrm{~F}_{9}

{ }^{15} \mathrm{~F}_{9}