Question

How many orbitals in total are associated with 4^th energy level?

• A. 4
• B. 9
• C. 16
• D. 7

Answer 1

Answer: (C)

16

Answer 2

: $n = 4,l = 0,1,2,3$

$m_{l} = \underset{s}{\overset{0,}{︸}}\underset{p}{\overset{- 1,0, + 1,}{︸}}\underset{d}{\overset{- 2, - 1,0, + 1, + 2}{︸}}\underset{f}{\overset{- 3, - 2, - 1,0, + 1, + 2, + 3}{︸}}$

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