Which nucleus completes the following equation?

Answer: [tex]^{50}_{25}Mn\rightarrow ^{0}_1e+ ^{50}_{24}Cr[/tex]
The chromium nucleus will complete the reaction.
Explanation:
The given reaction is a type of radioactive nuclei decay:
Positron emission: It is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. This is also known as [tex]\beta ^+[/tex]-decay. In this the mass number remains same.
[tex]_A^Z\textrm{X}\rightarrow _{Z-1}^A\textrm{Y}+_{+1}^0e[/tex]
Now according to the given reaction:
[tex]^{50}_{25}Mn\rightarrow ^{0}_1e+ ^{50}_{24}Cr[/tex]
The chromium nucleus will complete the reaction.