Electronegativity

$\chi =-0.5\left(I+A\right)\approx 0.5\left({\epsilon }_H+{\epsilon }_L\right)$

[1] [2]

Global Hardness

$\eta =\left(I-A\right)\approx \left({\epsilon }_L-{\epsilon }_H\right)$

[1] [2]

Electrophilicity

$\omega =0.5{\chi }^2/\eta$

[20]

Electrodonating Power

${\omega }^{-}=\left(3I+A\right){}^2/16\left(I-A\right)$

[21]

Electroaccepting Power

${\omega }^{+}={\left(I+3A\right)}^2/16\left(I-A\right)$

[21]

Net Electrophilicity

$\Delta {\omega }^{\pm }={\omega }^{+}+{\omega }^{-}$

[22]