Question

For ${}_{24}Cr$, which of the following statements is/are correct?

• A. Number of electrons with principle quantum number $3$ is $13$
• B. Number of electrons with azimuthal quantum number $1$ is $12$
• C. Number of electrons with magnetic quantum number $0$ is $12$
• D. Number of minimum or maximum electrons with spin quantum number $+1/2$ is $9$ or $15$

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Number of electrons with principle quantum number $3$ is $13$
B Number of electrons with azimuthal quantum number $1$ is $12$
C Number of electrons with magnetic quantum number $0$ is $12$
D Number of minimum or maximum electrons with spin quantum number $+1/2$ is $9$ or $15$

${}_{24}Cr-1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^5$

For $n=3$, no. of electrons$=13$

For $l=1,n=2$, no. of electrons$=8$

For $m=0\Rightarrow l=1$, no. of electrons$=8$

Minimum no. of electrons having$+\frac{1}{2}=9$

Maximum no. of electrons having$+\frac{1}{2}=15$