In a given atom,no two electrons can have the same values for all the four quantum numbers. This is called:

In the following two plots,$\psi^2$ is plotted against the distance '$r$' from the nucleus. Select the correct statement.

The quantum numbers $n$ and $l$ for four electrons are given as: $(1) \, n = 4, l = 1; \, (2) \, n = 4, l = 0; \, (3) \, n = 3, l = 2; \, (4) \, n = 3, l = 1$. Arrange them in increasing order of their energy.

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

Which of the following electronic configurations has the maximum total spin multiplicity?

Which of the following does not have valence electrons in the $3d-$subshell?