The orbital diagram represents the filling of electrons in the sub levels of an orbit. The filling of the orbitals in sub- levels follow some basic rules and principles.
The orbital diagram of an orbit containing 16 electrons will be as follows:
1s²2s²2p⁶3s²3p⁴
The maximum number of electrons in each sublevel of the orbitals are: 2 electrons for s-sublevel with one orbital 6 electrons for p-sublevel with three orbital 10 electrons for d-sublevel with five orbital 14 electrons for f-sublevel with seven orbital