Question

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

• A. $16\text{and}4$
• B. $12\text{and}5$
• C. $12\text{and}4$
• D. $16\text{and}5$

Answer 1

The correct option is B $12\text{and}5$

Electronic configuration of $Cr$ atom $Z=24=1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^1$
When $l=1,\text{p-subshell}$
Number of electrons=$12$
When $l=2$,$\text{d-subshell}$
Number of electrons =$5$