The number of unpaired electrons in Co^{2+} i | vedclass

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Question

(B) The atomic number of $Co$ is $27$.Electronic configuration of $Co$ is $[Ar] 3d^7 4s^2$.When $Co$ forms $Co^{2+}$,it loses two electrons from the $

Vedclass · Accepted Answer

$3$

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(B) The atomic number of $Co$ is $27$.Electronic configuration of $Co$ is $[Ar] 3d^7 4s^2$.When $Co$ forms $Co^{2+}$,it loses two electrons from the $4s$ orbital.Electronic configuration of $Co^{2+}$ is $[Ar] 3d^7 4s^0$.The $3d^7$ configuration has $5$ orbitals,where electrons are filled according to Hund's rule: two orbitals are fully filled (paired) and three orbitals are singly occupied (unpaired).Therefore,the number of unpaired electrons is $3$.

The number of unpaired electrons in $Co^{2+}$ is:

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