Question

4.5 quantization and quantum numbers
which of the following orbitals is largest in size?
o 3d
o 4d
o 2p
o 3p

Explanation:

Step1: Understand orbital size trend

Orbital size increases with the principal quantum number (n). For orbitals with the same angular - momentum quantum number (l), the one with a higher n is larger. Also, for a given n, the size increases with l (s < p < d < f).

Step2: Analyze each option

• For 3d: n = 3, l = 2.
• For 4d: n = 4, l = 2.
• For 2p: n = 2, l = 1.
• For 3p: n = 3, l = 1.

Since 4d has the highest principal quantum number among the given options, it is the largest.

Answer:

4d