Thermal-neutron fission of $^{235}_{92}U$ through $^{236}_{92}U$ gives primary fragments $^{99}_{41}Nb$ and $^{133}_{51}Sb$. These undergo three and four radioactive decays respectively to stable chain enders X₃ and Y₄. Identify them.
Neutron-rich fission fragments undergo β⁻ decay, which preserves mass number and increases atomic number by one. Three steps take Nb-99 from Z = 41 to Z = 44, Ru-99. Four steps take Sb-133 from Z = 51 to Z = 55, Cs-133. Therefore B. The primary mass sum is less than 236 because fission also releases neutrons; this does not change the beta-chain mass-number reasoning.
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