Examining a Positron decay equation

 A positron decay is a nuclear process that create a isobar,  two atoms wit same atomic number but different nuclear mass,  when an atom undergo positron decay , one of its protons decays into  a neuron and a positron,  the atomic number decreases by one while mass number remain uncanged.

 The decay is accompanied by a released of a positron and an electron neutrino

²³₁₂Mg → ²³ ₁₁Na + ⁰₁e  + v⁰₀.

¹²₆C → ¹² ₅B + ⁰₁e  + ⁰₀.

Example in the Above equations