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 explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for 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 explanation for Assertion. Full filled and half filled orbitals are more stable due to:-
Symmetrical distribution= More 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.