The number of neutrons accompanying the formation of and from the absorption of slow neutron by by n — Nuclear Chemistry and Radioactivity Chemistry Question

💡 Solution & Explanation

The balanced fission reaction is ${}_{92}\text{U}^{235} + {}_0\text{n}^1 \to {}_{54}\text{Xe}^{139} + {}_{38}\text{Sr}^{94} + x {}_0\text{n}^1$. Equating mass numbers: $235 + 1 = 139 + 94 + x \implies 236 = 233 + x \implies x = 3$. Therefore, correct answer is D.