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.

Both assertion and reason are correct and reason is the correct explaination of assertion.

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Both assertion and reason are correct but reason is not the correct explaination of assertion.

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Assertion is correct but reason is incorrect.

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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 distribution $\Rightarrow$ 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.

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Similar questions

Q. 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.

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

Q. Assertion (A) : Atoms with completely filled and half-filled subshells are stable.

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

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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.

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.