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Allred-Rochow scale

The force of attraction is given by:

force=eZ/r

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/r correlates well with Pauling electronegativities and the two scales can be made to coincide by expressing the Allred-Rochow electronegativity as:

AR=0.744 + 0.359Z/r

See also: Mulliken scale - Pauling scale



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