Question

What is the total number of orbitals in the third energy level (n = 3)?

• A. 9
• B. 16
• C. 4
• D. 3

Hint:

Remember: The number of orbitals in each energy level increases with the square of the principal quantum number \( n \). The formula is \( n^2 \).

Answer 1

The Correct Option is A

In the third energy level (\( n = 3 \)), there are three possible sublevels:

• The \( s \)-sublevel has 1 orbital.
• The \( p \)-sublevel has 3 orbitals.
• The \( d \)-sublevel has 5 orbitals.

The total number of orbitals in the third energy level is the sum of the orbitals in each sublevel:

\( 1 + 3 + 5 = 9 \)