Isodiaphers are pairs of nuclides characterized by having the same "isotopic number" or "neutron exc — Nuclear Chemistry and Radioactivity Chemistry Question

💡 Solution & Explanation

For Uranium-235, the mass number $A = 235$ and the atomic number $Z = 92$. The number of neutrons $N = A - Z = 235 - 92 = 143$. The isotopic number is the difference between neutrons and protons ($N - Z$), which is $143 - 92 = 51$. Alternatively, using $A - 2Z$, we get $235 - 2(92) = 235 - 184 = 51$.