(C) The electronic configuration of $Cr$ $(Z=24)$ is $[Ar] \, 3d^5 \, 4s^1$.In this configuration,there are $5$ unpaired electrons in the $3d$ subshel

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(C) The electronic configuration of $Cr$ $(Z=24)$ is $[Ar] \, 3d^5 \, 4s^1$.In this configuration,there are $5$ unpaired electrons in the $3d$ subshell and $1$ unpaired electron in the $4s$ subshell,totaling $6$ unpaired electrons.The stability of the $Cr$ atom is due to the half-filled $d$ subshell $(3d^5)$,not the $s$ orbital.Therefore,the Assertion is correct,but the Reason is incorrect.

Class 12 Chemistry d-and f-Block Elements General Characteristics

Easy

Assertion : The free gaseous $Cr$ atom has six unpaired electrons.
Reason : Half-filled $s$ orbital has greater stability.

AIIMS 2004 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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d-and f-Block Elements

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General Characteristics

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Discuss the position of $d$-block elements in the periodic table.

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The spin-only magnetic moment value of the ion among $Ti^{2+}$,$V^{2+}$,$Co^{3+}$,and $Cr^{2+}$ that acts as a strong oxidizing agent in aqueous solution is .......... $BM$ (nearest integer).
(Given atomic numbers: $Ti = 22, V = 23, Cr = 24, Co = 27$)

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Assertion : The free gaseous $Cr$ atom has six unpaired electrons.Reason : Half-filled $s$ orbital has greater stability.

Similar Questions

Discuss the position of $d$-block elements in the periodic table.

Which metal in the first series of transition metals exhibits $+1$ oxidation state most frequently and why?

Identify the set of paramagnetic ions among the following.

Which of the following elements are not regarded as transition elements?

The spin-only magnetic moment value of the ion among $Ti^{2+}$,$V^{2+}$,$Co^{3+}$,and $Cr^{2+}$ that acts as a strong oxidizing agent in aqueous solution is .......... $BM$ (nearest integer).(Given atomic numbers: $Ti = 22, V = 23, Cr = 24, Co = 27$)

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Assertion : The free gaseous $Cr$ atom has six unpaired electrons.
Reason : Half-filled $s$ orbital has greater stability.

The spin-only magnetic moment value of the ion among $Ti^{2+}$,$V^{2+}$,$Co^{3+}$,and $Cr^{2+}$ that acts as a strong oxidizing agent in aqueous solution is .......... $BM$ (nearest integer).
(Given atomic numbers: $Ti = 22, V = 23, Cr = 24, Co = 27$)