force=e²Z/r²
where r is the distance between the electron and the nucleus (covalent radius). e is the charge on an electron. eZ is the charge effective at the electron due to the nucleus and its surrounding electrons.
The quantity Z/r² correlates well with Pauling electronegativities and the two scales can be made to coincide by expressing the AllredRochow electronegativity as:
AR=0.744 + 0.359Z/r²
See also: Mulliken scale  Pauling scale
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