Allred and Rochow suggest a scale of electronegativity based upon the electrostatic force of attraction between the nucleus and the valence electrons. The values expressed here are converted to the Pauling scale (see below). The Allred-Rochow electronegativity is often denoted as ΧAR
Most values are taken from reference 1. Additional values for elements 40-46 and 58 onwards are contained within reference 2. Values for elements 95-102 are estimates. Values for Group 18 elements are taken from reference 3. Essentially similar data for Allred-Rochow electronegativities are given in references 4 and 5, as well as many text books.
The force of attraction is given by:
force = e2Zeff/r2
The quantity Zeff/r2 correlates well with Pauling electronegativities and the two scales can be made to coincide by expressing the Allred-Rochow electronegativity as:
ΧAR = 0.744 + 0.359Zeff/r2
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