Mulliken scale

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:

Element	Al	Ar	As	B	Be	Br	C	Ca	Cl	F	Ga	Ge	H	I	In	K	Kr	Li
cM	1.37	3.36	2.26	1.83	1.99	3.24	2.67	1.30	3.54	4.42	1.34	1.95	3.06	2.88	1.30	1.03	2.98	1.28

Element	Mg	N	Na	Ne	O	P	Rb	S	Sb	Se	Si	Sn	Sr	Te	Xe
cM	1.63	3.08	1.21	4.60	3.21	2.39	0.99	2.65	2.06	2.51	2.03	1.83	1.21	2.34	2.59

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