The number of unpaired electrons in cobalt at | vedclass

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(B) The atomic number of cobalt $(Co)$ is $27$.The electronic configuration of $Co$ is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^7 4s^2$.In the $3d$ subshell,there

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$3$

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(B) The atomic number of cobalt $(Co)$ is $27$.The electronic configuration of $Co$ is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^7 4s^2$.In the $3d$ subshell,there are $7$ electrons. According to Hund's rule,these electrons fill the five $d$-orbitals as follows: $\uparrow\downarrow, \uparrow\downarrow, \uparrow, \uparrow, \uparrow$.This results in $3$ unpaired electrons in the $3d$ subshell.Therefore,the correct option is $B$.

The number of unpaired electrons in cobalt atom is (atomic number of $Co = 27$)

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