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a
Average Binding energy
b
Packing fraction
c
Ratio of number of neutrons and protons
d
All the above
answer is D.
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Detailed Solution
Stability of a nucleus depends on average binding energy per nucleon , packing fraction M-AA where M is the calculated mass and A is the mass no if it is negative nucleus is stable and neutron proton ratio if it is more than 1.6 nucleus will be definitely unstable (lead has highest value of 1.53 which has a stable nucleus)