How many unpaired electrons are present in co | vedclass

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(B) The atomic number of cobalt $[Co]$ is $27$.The electronic configuration of cobalt is $[Ar] \, 3d^7 4s^2$.In the $3d$ subshell,there are $7$ electr

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$3$

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(B) The atomic number of cobalt $[Co]$ is $27$.The electronic configuration of cobalt is $[Ar] \, 3d^7 4s^2$.In the $3d$ subshell,there are $7$ electrons. According to Hund's rule,these electrons are filled as follows:$3d^7$: The first $5$ electrons occupy the $5$ orbitals singly,and the remaining $2$ electrons pair up in the first two orbitals.This leaves $3$ orbitals with a single electron each.Therefore,there are $3$ unpaired electrons in cobalt metal.

How many unpaired electrons are present in cobalt $[Co]$ metal?

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