Respuesta :
When n= 4 then Second quantum number l = n-1= 4-1=3
Which are 0,1,2, 3 hence there are 4 subshell which are s,p,d and f

When n= 4 then Second quantum number l = n-1= 4-1=3
Which are 0,1,2, 3 hence there are 4 subshell which are s,p,d and f