# Is charge conserved in positron emission?

by Bipolarity
Tags: charge, conserved, emission, positron
 P: 783 Consider the reaction: $^{39}_{20}Ca \rightarrow ^{39}_{19}K + \beta^{+}$ I understand that a proton in the Calcium nucleus is being split into a neutron, which stays in the nucleus, and a positron, which gets ejected. But if you look at the equation above, charge is not conserved. The only thing I can think of doing to balance is to consider the potassium product as a negative ion, but that makes no sense to me? Or perhaps I am missing something. Or perhaps it has something to do with the number of electrons in play. Any help is appreciated. Thanks! BiP