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

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

Answers (1)

Mass defect: It is found in that the mass of the nucleus is always less than the masses of its constituent nucleons in a free state. This difference in masses is called the mass defect. Hence mass defect

\Deltam=Sum of masses of nucleons-mass of nucleus

={Zmp+(A-Z)mn} M={Zmp+Zme+(A-Z)mn}-M'

Where mp=Mass of Proton, mn=Mass of each neutron, me= Mass of each electron

M=Mass of nucleus, Z= Atomic number, A=Mass member,M'=Mass of atom as a whole

Binding Energy: The neutron and protons in a stable nucleus are held together by nuclear forces and energy is needed to pull them indefinitely apart (or the same energy is released during the formation of the nucleus). This energy is called the binding energy of the nucleus.

                                         Or

The binding of the nucleus can also be described as the energy equivalent tot eh mass defect of the nucleus.

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