Assertion (A) : The mass of a nucleus is less than the sum of the masses of the constituent nucleons.
Reason (R) : Energy is absorbed when the nucleons are bound together to form a nucleus.
Show Hint
Formation of a stable nucleus always releases energy.
\[
\text{Mass defect}
\Longleftrightarrow
\text{Binding Energy}
\]
A larger binding energy means a more stable nucleus.