When a nucleus undergoes nuclear decay by gamma rays the atomic number of the element?

I believe that when a nucleus undergoes a nuclear decay by gamma rays the atomic number of element remains the same. Atomic number is the number of protons of a given atom of an element. Gamma decay unlike alpha and beta decay does not have an effect on the mass number and atomic number of an atom.

Is there a diagram/picture you can provide? it seems this question goes along with a