Chemistry - Atomic Structure Question with Solution | TestHub

The graph shown is of $4\pi r^2{R}^2$ vs $r$ and contains 3 maxima, which means there are 2 radial nodes (nodes = maxima $-1$).

For an orbital: Radial nodes $=n-l-1$.

Checking the options: For 3s orbital, radial nodes $=3-0-1=2$, which matches the graph.

Therefore, the correct answer is (A) 3s orbital, 2 radial nodes.