Question

The graph betweeen $|\Psi {|}^2$ and $r$ (radial distance) is shown below. This represents :-

• A. 3s orbital
• B. 1s orbital
• C. 2p orbital
• D. 2s orbital

Answer 1

Answer: (D)

Graph of $\left|{\Psi }^2\right|v/sr$, touches $r$ axis at $1$ point so it has one radial node and since at $r=0$, it has some value so it should be for ${}^{\prime }{s}^{\prime }$ orbital.
$\therefore n-\ell -1=1$
where $\ell =0\Rightarrow n-1=1$
$\therefore n=2\Rightarrow {}^{\prime }2s^{\prime }$ orbital