Beta-plus decay or positron decay of an element with an atomic number of 11 and a mass number of 22. In beta-plus decay,
there are too many protons and not enough neutrons for the element to be stable, so a proton turns into a neutron. The
beta-plus decay or positron symbol isẞ ore symbolizing that you change a proton from the original element into a
neutron.

22 Na -> _ + _
11