There is no possibility to have equal no of electrons in every shell..
but it is possible to have equal electrons in K=L or K=M or L=M.
K=L it can be 2=2 which is Beryllium
K=M it can be 2=2 which is Magnessium
L=M it can be 8=8 which is Argon.
please conform your question then ask.... :)