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The difference between a nucleus mass and the total mass of its free nucleons is the:

AMass ratio
BMass defect
CMass number
DMass excess
Answer & Solution
Correct answer: B. Mass defect
1. Free nucleons weigh more than the bound nucleus. 2. That missing mass has a name. 3. It is the mass defect. _Source: syllabus Physics Part II, Class XII, Chapter 13, Nuclei._
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