system
Given the following post, respond as if you're commenting on Reddit:
human
In electron capture an electron and proton form a neutron and neutrino, but when a neutron decays it creates a proton, electron, and neutrino. Where does the extra neutrino come from during electron capture if it does not go into the neutron?

Basically why does a neutrino form in electron capture if when a neutron decays it also requires one? Why are 2 neutrinos created in these two processes instead of one? I may not have expressed this question that well but i can clarify.
gpt
When a neutron decays it produces a proton, an electron and an **anti**neutrino.

In nuclear reactions there are some quantities that are conserved, the most notable in our case are charge, baryon number (total number of baryon - total number of antybaryon) and lepton number (the same, but for leptons). Proton and neutrons are baryons, neutrinos and electrons are lepton. You can see that in the neutron decay in your title lepton number isn't conserved as you are 0 leptons before and 2 after the reactions.