Question

For a multi-electron atom, the highest energy level among the following is:

• A. $n=5,l=0,m=0,s=+\frac{1}{2}$
• B. $n=4,l=2,m=0,s=+\frac{1}{2}$
• C. $n=4,l=1,m=0,s=+\frac{1}{2}$
  
• D. $n=5,l=1,m=0,s=+\frac{1}{2}$
  

Answer 1

The correct option is D $n=5,l=1,m=0,s=+\frac{1}{2}$


a. $n=5,l=0,m=0,s=+\frac{1}{2}\Rightarrow 5s$
b. $n=4,l=2,m=0,s=+\frac{1}{2}\Rightarrow 4d$
c. $n=4,l=1,m=0,s=+\frac{1}{2}\Rightarrow 4p$
d. $n=5,l=1,m=0,s=+\frac{1}{2}\Rightarrow 5p$
Increasing order of energy level:
$4p<5s<4d<5p$
So, the highest energy level is $5p$.