# How is the atomic number affected by beta decay?

Durning ${\beta}^{-}$ it increases by one. Durning ${\beta}^{+}$ it decreases by one.
Durning ${\beta}^{-}$ a neutron turns into a proton, an electron and anti-electron neutrino are emitted in the process. The electron is the beta particle in this reaction. The nucleus gains a proton in this reaction so the atomic number increases by one.
Durning ${\beta}^{+}$ a proton turns into a neutron, a positron and electron neutrino are emitted in the process. The positron is the beta particle in this reaction. The nucleus loses a proton in this reaction so the atomic number decreases by one.