Question

The total number of orbitals in the fifth energy level is:

• A. $5$
• B. $10$
• C. $18$
• D. $25$

Answer 1

The correct option is D $25$

For fifth energy level, $n=5$

So $l=0$ $to$ $(n-1)=0,1,2,3,4$

it will have 5s, 5p, 5d, 5f, 5g.

For s orbital it has 1 orbital

For p orbital it has 3 orbital

For d orbital it has 5 orbital

For f orbital it has 7 orbital

For g orbital it has 9 orbital

Total no of orbitals will be $1+3+5+7+9=25$ orbitals.