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The extra stability of half-filled and completely-filled subshell is due to

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The extra stability of half-filled and completely-filled subshell is due to
A. relatively small shielding
B. smaller coulombic repulsion enegry
C. larger exchange enegry
D. all of these
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Correct Answer - D
Electrons in the same subshell have equal enegry but different spatial distribution. Consequently, their shielding of one another is relative small.
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