$\beta^+$ decay of $^{50}\textrm{Mn}$

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View sample solutionThis is College Physics Answers with Shaun Dychko. In the positron decay of manganese, we can imagine that a proton turns into a neutron so the proton number has decreased from 25 into 24 and that proton that has disappeared has turned into a neutron. So the number of neutrons has increased from 25 to 26. And the number of nucleons is the same though; it's 50 in both cases, the total of protons plus neutrons remains 50. This is now chromium and in order to conserve charge because a positive charge was lost here, there needs to be the creation of a compensating positive charge which is this positron. This positron is the anti-particle to an electron and for that reason, it has an electron family number of negative 1 and in order to compensate for that, we need to have a particle that has an electron family number of positive 1 which this electron neutrino has. So the electron family number is conserved; the charge is conserved because where you had 25 to begin with and now we have 24 plus 1 which is 25 so charge is conserved and there we go. That's positron decay of manganese.