The mass of an atomic nucleus is less than the sum of the masses of its constituents. Thus mass defect is converted in to

Why the mass of the nucleus is less than the sum of masses of the nucleons?

The mass of a H-atom is less than the sum of the masses of a proton and electron. Why is this?

The mass of a H-atom is less than the sum of the masses of a proton and electron. Why is this?

The mass of a H- atom is less than the sum of the masses of a proton and electron. why is this?

The mass of a a_3^7 Li nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of ._3^7 Li nucleus is nearly.