First slide

Nuclear Binding energy

Question

The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus. This implies that helium

Moderate

A

Can easily be broken up
B

Is very stable
C

Can be used as fissionable material
D

Is radioactive

Solution

The elements high on the B.E. versus mass number plot are very tightly bound and hence, are stable. And the elements those are lower on this plot, are less tightly bound and hence, are unstable.
Since helium nucleus shows a peak on this plot so, it is very stable.

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