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.

List-$I$ (Property)	List-$II$ (Metal)
$A$. Element with maximum second ionization enthalpy	$i$. $Co$
$B$. Element with maximum third ionization enthalpy	$ii$. $Cr$
$C$. $M$ in $M(CO)_6$	$iii$. $Cu$
$D$. Element with maximum enthalpy of atomization	$iv$. $Zn$
	$v$. $Ni$

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

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