Question

How many orbitals in total are associated with fourth energy level?

• A. 4
• B. 9
• C. 16
• D. 7

Answer 1

Answer: (C)

$n=4,l=0,$ $1,$ $2,$ $3$
${\text{m}}_{\text{1}}=\underset{\text{s}}{\underbrace{0}}\underset{\text{p}}{\underbrace{-1,0,+1}}\underset{\text{d}}{\underbrace{-2,-1,0,+1,+2}}\underset{\text{f}}{\underbrace{-3,-2,-1,0,+1,+2,+3}}$

Total number of orbitals $1s+3p+5d+7f=16$