azimuthal quantum number
The azimuthal quantum number is one of the four quantum numbers that characterize the electron configuration of an atom. The azimuthal quantum number (l) can take the values 0, 1, 2, ..., n-1, where n is the principal quantum number. It denotes the angular momentum of an electron in an orbital and corresponds to the shape of the orbital (i.e. the most probable electron distribution). Azimuthal quantum numbers 0, 1, 2, and 3, correspond to the s, p, d, and f orbitals, respectively.