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

🧠 The Nodal Fingerprint Nodes define the architecture of an orbital.

• No Angular Nodes: Means $l = 0$. This identifies the orbital as an s-orbital.
• Two Radial Nodes: Means $n - l - 1 = 2$.

🗺️ The Identifying Math

1. From Angular Nodes: $l = 0$.
2. From Radial Nodes: $n - 0 - 1 = 2 \implies n = 3$
3. The Identity: Combining $n=3$ and $l=0$ gives the 3s orbital.

⚡ The "n-1" rule Total nodes always equal $n-1$. If an orbital has $2$ radial and $0$ angular nodes, its total nodes are $2+0=2$. Thus, $n-1 = 2$, which means $n=3$. If $l=0$, it must be 3s.

⚠️ Common Traps Don't confuse $2p$ with $3s$. $2p$ has 1 angular and 0 radial nodes. Always check both node types!

$\boxed{\text{Answer: (b)}}$