The Mulliken scale (also called Mulliken-Jaffe scale) is a scale for the electronegativity of chemical elements. It was developed by Robert S. Mulliken in 1934. It is based on the Mulliken electronegativity, c_M, which is related to the electron affinity EA_v (the tendency of an atom to become negatively charged) and the ionization potential IE_v (the tendency of an atom to become positively charged):

c_M = (IE_v + EA_v)/2

Some example values:

See also : Pauling scale -- Allred-Rochow scale -- Electronegativity