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Question

Assertion:
Atoms with completely filled and half filled subshells are stable.

Reason:
Completely filled and half-filled subshells have the symmetrical distribution of electrons and have maximum exchange energy.

A
Both assertion and reason are correct and reason is the correct explaination of assertion.
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B
Both assertion and reason are correct but reason is not the correct explaination of assertion.
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C
Assertion is correct but reason is incorrect.
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D
Assertion is incorrect but reason is correct.
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Solution

The correct option is A Both assertion and reason are correct and reason is the correct explaination of assertion.
Full filled and half filled orbitals are more stable due to:-
Symmetrical distributionMore symmetry, more stability, and half filled & completely filled orbitals have symmetrical distribution.

Exchange energy:- More exchange energy, more stability and these orbitals have more number exchanges of stabilization i.e. shifting of electrons from one orbital to another within same sub-shell.

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