A) \[\frac{M}{M-A}\]
B) \[\frac{M-A}{A}\]
C) \[\frac{A}{M-A}\]
D) \[\frac{A-M}{A}\]
Correct Answer: B
Solution :
The mass excess per nucleon of isotopes of atom is known as packing fraction given by \[P=\frac{M-A}{A}\]where M is the actual mass of isotope and A is its atomic mass. Packing fraction is positive for isotope having very low or very high mass number and negative for all others.
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