Aradioactive nuclide is used to detect eye tumors. an atom of this radionuclide contains 15 protons, 15 electrons, and 17 neutrons. which is symbol of this radionuclide?

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

Its trait is different and it the organism survive