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15 protons and 15 electrons, but 17 neutrons.

Having 17 neutrons (not even to the # of protons) would result in a radioactive isotope. An isotope is when the neutrons in the nucleus aren't equivalent to the protons.

The symbol of radionuclide would be : An isotope
Hey there

We know that a radioactive nuclide is used to detect eye tumors.  An atom of this radionuclide contains 15 protons, 15 electrons, and 17 neutrons. 

The answer is isotope. Atoms that have the same number of protons but different numbers of neutrons are called isotopes.

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