The azimuthal quantum number  describes the orbital angular momentum of each electron and is a non-negative integer. Within a shell where  is some integer ,  ranges across all (integer) values satisfying the relation .
The azimuthal quantum number, which represents the orbital angular momentum of an electron, is a non-negative integer. In a given shell with the azimuthal quantum number 'n', it takes on all integer values that satisfy the relationship .