Distribution of electrons in shells

Electons:

Electrons is very light particles . it has negative charge. it revolves around the nuclrus of an atom.

Shells:

The paths of movemnent of electrons around the nuclens are called shells . shells are also calld energy levels.

Shell Number	Maximum number of electrons
shell number 1 or K-shell	2n2   = 2(1) = 2
shell number 2 or L-shell	2n2   =2(2)= 4
shell number 3 or M -shell	2n2   =2(3) = 6