For $n = 3$ energy level,the number of possible orbitals (all kinds) are

The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by

How many electrons can be accommodated in a sub-shell for which $n = 3, l = 1$?

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:

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. no. $Z = 22$)

Which of the following elements has the outer electronic configuration $3s^2 3p^5$?