Table 3 Values and definitions of properties of astatine derived from the EA and IE.

From: The electron affinity of astatine

Property

Definition

Value

Electron affinity

EA

2.41578(7) eV

Ionization energy

IE

9.31751(8) eV12

Electronegativity

\({\chi }_{{\rm{M}}}=\frac{{\rm{IE}}+{\rm{EA}}}{2}\)

5.86665(7) eV

Hardness

\(\eta =\frac{{\rm{IE}}-{\rm{EA}}}{2}\)

3.45087(7) eV

Softness

\(S=\frac{1}{2\eta }\)

0.14489(2) eV−1

Electrophilicity

\(\omega =\frac{{\chi }_{{\rm{M}}}^{2}}{2\eta }\)

4.98680(16) eV

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