Question
Tue December 13, 2011 By: Atishay Jain

I want to know that why the individual masses of proton and neutron > than mass of nucleus it means in combined form mass decreases than the individual masses due to repulsion or any other method. tell me the concept of this?

Expert Reply
Tue December 13, 2011
The mass of neutrons and protons forming a nucleus is greater than the mass of the nucleus. This difference is called mass defect and it is responsible for binding the nucleus together. Since mass and energy are equivalent, the decrease in mass appears in the form of binding energy which binds the nucleons together in the nucleus.
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