In n=4 energy level, l=0,1,2,3 i.e. s,p,d,f subshells. Magnetic quantum number ml have values from −l to +l For n=4, possible values of l and ml are l=0,ml=0 l=1,ml=−1,0,+1 l=2,ml=−2,−1,0,+1,+2 l=3,ml=−3,−2,−1,0,+1,+2,+3 Total number of orbitals =16 Total number of electrons will be 32 . ∴ Maximum number of electrons with spin value (+