"Isodiaphers" are pairs of atoms defined by having the exact same "isotopic number" or "neutron exce — Nuclear Chemistry and Radioactivity Chemistry Question
Question
"Isodiaphers" are pairs of atoms defined by having the exact same "isotopic number" or "neutron excess". Mathematically, what does this isotopic number represent, and which pair below forms valid isodiaphers?
Answer: C
💡 Solution & Explanation
Isotopic number is $N-Z$, which equals $(A-Z)-Z = A-2Z$. For U-235: $235 - 2(92) = 51$. For Th-231: $231 - 2(90) = 51$. An $\alpha$ -decay parent/daughter pair always forms an isodiaphere.
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