Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is:
Correct answer: C. Greater
- A. Negligible
- B. Same
- C. Greater
- D. Smaller
Explanation
The sum of the masses of the constituent nucleons (protons and neutrons) is actually greater than the mass of the resultant nucleus. This difference in mass is known as the mass defect.The mass defect is given by the equation:Δm=Zmp +(A−Z)mn −mnuc where:Z is the number of protons,mp is the mass of a proton,A is the total number of nucleons,mn is the mass of a neutron, andmn uc is the mass of the nucleus
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About Composition of Atomic Nuclei
Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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