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Why there is mass defect?

  1. Nov 3, 2004 #1
    why there is mass defect in a nuclide?
    thank you.
  2. jcsd
  3. Nov 3, 2004 #2

    James R

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    The nucleus has a lower mass than its constituent nucleons (protons and neutrons) when they are free particles.

    The "missing mass" or "mass defect" is the amount of mass converted to binding energy when the nucleus formed (E=mc^2).
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