The packing fraction of an element is a measure of its stability and is defined relative to its mass — Nuclear Chemistry and Radioactivity Chemistry Question

💡 Solution & Explanation

Packing Fraction = $\frac{\text{Actual isotopic mass} - \text{Mass number}}{\text{Mass number}} \times 10^4$. For Carbon-12, the actual isotopic mass is exactly 12 by definition, and its mass number is 12. Therefore, $\frac{12 - 12}{12} \times 10^4 = 0$.