Azimuthal quantum number

can describe an electron in an atom completely: Principal quantum number (n) Azimuthal quantum number Magnetic quantum number Spin quantum number (s)

identified by the letters s, p, d, f, g, h, i, etc., corresponding to the azimuth quantum numbers: 0, 1, 2, 3, 4, 5, 6, etc. Each shell is able to hold 2, 6

described by its three quantum numbers. The principal quantum number is the electron shell number. The azimuthal quantum number is represented by a letter: