Question

Consider the ground state of $Cr$ atom (Z = 24). The number of electrons with the azimuthal quantum numbers, $I$ = 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

Electron configuration of Cr atom(Z=24)
$=1s^2,2S^{2}2p^6,3s^{2}3p^{6}3d^5,4s^1$
When I=1, p-subshell, $2p^6,3p^6$ numbers of electrons = 12
When I=2, d-subshell $3d^5$,
Numbers of electtrons = 5