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. 2022 Aug 8;13(37):10985–11008. doi: 10.1039/d2sc01096h

Electronegativities of selected atoms and functional groups.

Atom or group χ P χ e χ H χ J
H 2.20 2.28
F 3.98 3.95
Cl 3.16 3.03
Br 2.96 2.80
I 2.66 2.47
NO2 3.40
CN 3.30
CF3 3.35 3.46 3.29
CHF2 3.00 2.94
CH2F 2.61 2.61
CH3 2.30 2.27 2.30