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The plots of radial distribution functions for various orbitals of hydrogen atom against $r$ are given below.
The correct plot for $3s$ orbital is

The maximum number of electrons that can be accommodated in all orbitals with quantum numbers $n = 3$ and $l = 2$ is $......$.

The atomic number of an element having the valence shell electronic configuration $4s^2 4p^6$ is

Which pair of atoms or ions will have the same electronic configuration?

The correct set of four quantum numbers for the valence electron of rubidium atom $(Z = 37)$ is

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