Question

A certain orbital has no angular nodes and two radial nodes. The orbital is:

• A. 2p
• B. 3p
• C. 2s
• D. 3s

Answer 1

The correct option is D 3s

The number of angular nodes is always equal to the orbital angular momentum quantum number, l.
s-orbitals does not have angular nodes.
For s-obitals, $l=0$

Radial nodes = n – ℓ –1 = n – 0 – 1 = 2

$\therefore$ n = 3

Hence, the orbital is $3s$