The "packing fraction" is an alternative measure of nuclear stability. By definition, which specific — Nuclear Chemistry and Radioactivity Chemistry Question

💡 Solution & Explanation

Carbon-12 is taken as the universal reference standard on the atomic mass scale. Because its actual isotopic mass is exactly $12$, its packing fraction [$(\text{Actual Mass} - \text{Mass Number})/\text{Mass Number}$] evaluates to exactly zero.