Question

What is the maximum number of electrons that can be accommodated in each of the orbits (shells) K, L, M, N, etc.?

Answer 1

The number of maximum electrons in different orbits of the atom are fixed.
The orbit (shell) closest to the nucleus is: given the number 1, the next orbit the ; number 2… etc.
The orbits one are designated ; by letters K, L, M, N,… corresponding to the shell numbers n = 1, 2, 3, 4, … etc.
The maximum number of electrons in a given orbit is 2n², when n is the number of orbit (shell), thus the first shell has the capacity of 2 electrons, the second 8, the third 18, the fourth 32 and so on. The electrons in the K shell have minimum energy. The electrons in the subsequent shells possess higher energy.

Shell / Orbit	$2n^2$	Maximum number of electrons in the orbit (shell)
Symbol	Number n
K	1	$2\times 1^2$	2
L	2	$2\times 2^2$	8
M	3	$2\times 3^2$	18
N	4	$2\times 4^2$	32