Question

What is mass defect? At ground state mass of a nucleus is always
less than the sum of mass of its constituents (protons and neutrons)
Give reasons​

Answer 1

Explanation:

Since the nucleus is made up of neutron and proton so it is expected that the mass of the nucleus is equal to the total mass of its individual constituents however, it found less than its total mass of its constituents because during the formation of the nucleus some amount of energy gets released.