
Concept explainers
(a)
Interpretation:
Sodium isotope is only occurring in nature which is does not radioactive.
Mass defect of Sodium has to be calculated.
(a)

Answer to Problem 20.122QP
Mass defect of Sodium is 0.2003297 amu.
Explanation of Solution
To calculate: Mass defect of Sodium
Mass of eleven protons =11×1.00728 amu = 11.08008 amuMass oftwelveneutrons=12×1.008665 amu =12.10398 amuTotal mass of nucleons =(11.08008+12.10398) amu =22.98373029 amu
Nuclear mass of 2311Na = 22.98976929 amu - (11× 0.000549 amu) = 22.98373029 amu
Mass defect = total mass - nuclear mass =(23.18406-22.98373029)amu = 0.2003297amu
(b)
Interpretation:
Sodium isotope is only occurring in nature which is does not radioactive.
The nuclear binding energy of Sodium nucleon in MeV has to be calculated.
(b)

Answer to Problem 20.122QP
The nuclear binding energy of Sodium nucleon is 186.64 MeV.
Explanation of Solution
To calculate: nuclear binding energy of Sodium nucleon
ΔE = (Δm)c2 = 0.2003297amu ×1g6.022×1023×1amu×1kg103g ×(2.998×108m/s)2×1MeV1.602×10-13J =186.64 MeVBinding energy per nucleon =186.64 MeV23nucleons =8.115MeV/nucleon
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Chapter 20 Solutions
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