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The number of electrons present in $C o^{2 +}$ having azimuthal quantum number $l = 1$ is :

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$6$

$8$

$10$

$12$

answer is D.

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Detailed Solution

$C o^{2 +} : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{7}$

Number of electron in l=1, implies the number of electrons present in $p -$ subshells, which is 12 (6 from 2p and 6 from 3p).

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