Question 5 • Physical Science
In beta plus decay, a proton changes into a neutron and emits a positron, written as ⁰₊₁e. The mass number stays 11, while carbon’s atomic number decreases from 6 to 5, producing boron-11. Thus the balanced equation is ¹¹₆C → ¹¹₅B + ⁰₊₁e, which is choice C.
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