If a U-238 nucleus splits into two identical parts, the two nuclei so produced will be

U-238 has 92 protons and 146 neutrons. If it splits into two IDENTICAL nuclei, each gets 46 protons and 73 neutrons, forming Pd-119. Pd-119 has a neutron-to-proton ratio of 1.59, far above the stability line of ~1.3 for medium-mass nuclei. This extreme neutron excess makes it highly unstable, requiring radioactive decay to reach stability. Option B (stable) is wrong because equal fission of a heavy nucleus always produces neutron-rich fragments. Option C (isotopes) is incorrect - the two fragments ARE identical isotopes of Pd-119. Option D (isobars) is wrong because isobars have different atomic numbers, but these fragments both have Z=46.