$(a)$ Explain Bohr$-$Bury rules for the distribution of electrons into different shells.
$(b)$ Write the electronic configuration of an atom of sulphur. Also,draw a schematic diagram of its atom showing the distribution of electrons in its shells.

(N/A) Bohr$-$Bury Rules:
$(i)$ The maximum number of electrons present in a shell is given by the formula $2n^2$,where $n$ is the orbit number or shell number.
$(ii)$ The maximum number of electrons that can be accommodated in the outermost orbit is $8$.
$(iii)$ Electrons are not accommodated in a given shell unless the inner shells are filled. The shells are filled in a step-wise manner.
$(b)$ The atomic number of sulphur $(S)$ is $16$. Its electronic configuration is $2, 8, 6$.
Schematic diagram of the sulphur atom:
The atom has a nucleus at the center,with $2$ electrons in the $K$-shell,$8$ electrons in the $L$-shell,and $6$ electrons in the $M$-shell.