The azimuthal quantum number for the last electron of the $Na$ atom is:

The correct set of four quantum numbers for the outermost electron of sodium $(Z=11)$ is

An electron is in one of the $3d$ orbitals. Give the possible values of $n$,$l$,and $m$ for this electron.

Which of the following orbitals has zero probability of finding an electron in the $yz$ plane?

The number of radial nodes present in $3p$ orbital is

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: