What is the maximum number of electrons that can be present in M-shell?
M-shell is the 3rd shell. For 3rd shell, n = 3. Hence, the maximum number of electrons that can be present in M-shell = 2n2= 2 x32 = 18.
What are the maximum number of electrons that can be present in the K, L and M shells?
What is the maximum number of electrons that can be filled in the outermost shell?