Answer :

Isotopes are atoms with the same number or protons and electrons but different numbers of neutrons. 
Here, we got Z = 29 so the charge of the nucleus is 29, and A is the atomic mass. 
Since the atom number (Z) is 29, so i guess the isotope is the Copper. 
Isotopic notation: [tex]Cu_{29}^{65} [/tex]

Hope this Helps :)

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