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When the atomic number A of the nucleus increases
(A) initially the neutron-proton ratio is constant \( =1 \)
\( \mathrm{P} \)
(B) initially neutron-proton ratio increases and later decreases
W
(C) initially binding energy per nucleon increases and later decreases
(D) the binding energy per nucleon increases when the neutron-proton ratio increases.
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