Question

The sum of the masses of constituent particles of a nucleus of atom is?

• A. Equal to the mass of the nucleus
• B. Smaller than the mass of the nucleus
• C. Greater than the mass of the nucleus
• D. Always varying

Answer 1

The correct option is B Smaller than the mass of the nucleus

$\begin{array}{c}\text{The sum of the masses of constituent particles of}\\ \text{a nucleus of atom is smaller than the mass of}\\ \text{the nucleus according to the relation of}\\ \text{mass defect (m).}\end{array}$

$\begin{array}{c}\Delta m=\left(\text{Mass of Nucleus - (Mass of neutron + mass of protons}\right))\\ \Rightarrow \Delta M>O\end{array}$