For the last electron entering the electronic configuration of potassium $(K)$,the values of $n, l,$ and $m$ are respectively .......

The quantum number '$n$' for a free gaseous atom is associated with which of the following?

The correct set of four quantum numbers for the outermost electron of potassium $(Z=19)$ is

In a potassium atom,the electronic energy levels are in the following order:

In which of the following,orbitals are correctly arranged in the increasing order of their energies?

If the nitrogen atom had electronic configuration $1s^7$,it would have energy lower than that of the normal ground state configuration $1s^2, 2s^2, 2p^3$ because the electrons would be closer to the nucleus. Yet,$1s^7$ is not observed because it violates: