Question

Who suggested the distribution of electrons into different shells? How are the electrons distributed across these shells?

Answer 1

The distribution of electrons across the energy shells was suggested by Bohr and Bury.

According to the Bohr-Bury scheme, the electrons are distributed across the shells according to the following rules:
(i) The maximum no. of electrons which any shell can accomodate is given by $2n^2$ where n is the number of shell ( n for K = 1, for L =2, etc.)
(ii) The maximum number of electrons which can be accomodated in the outermost shell is 8.
(iii) Electrons are not accomodated in a given shell unless the inner shells get filled to their capacity first.