Question

What particle does argon-39 emit when it decays to potassium-39?

Answer 1

Answer:

Atomic number 18 emits a electron when it decays to atomic number 19

Explanation:

Answer 2

Argon-39 emits electron because changes only nucleus charge of the atom.$_{18}^{39}Ar ---\ \textgreater \ _{19}^{39}K +e^{-}$