Question

Consider the ground state of $Cr$ atom $(z=24)$. The number of electrons with the azimuthal quantum numbers, $l=1$ and 2 are, respectively

• A. 16 and 4
• B. 12 and 5
• C. 12 and 4
• D. 16 and 5

Answer 1

The correct option is B 12 and 5

Electronic configuration of $Cr$ atom $(z=24)$
$=1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^5,4s^1$
when $l=1,p-$ subshell,
So, total number of electrons in p-subshell$=12$
when $l=2,d-$subshell
So, total number of electrons in d-subshell$=5$
$\therefore$ The correct answer will be option (b)