Table 1. Isotropic polarizabilities (atomic units) chosen for monatomic cations and anions.

For comparison with the values chosen for monatomic ions, the first row for each atomic species also lists the atomic polarizability (Thakkar & Lupinetti, 2006 ▸).

	Li	Na	K	Rb	Cs
Neutral atom	164.0	162.9	291.1	316.2	396.0
Cation, X +	0.190†	0.986†	5.4†	9.1†	15.7†
	Be	Mg	Ca	Sr	Ba
Neutral atom	37.74	71.22	157.9	199.0	273.5
Cation, X 2+	0.052†	0.482†	3.2†	5.8†	10.6†
	F	Cl	Br	I
Neutral atom	3.70	14.57	21.13	32.98
Anion, X −	7.25‡	21.2‡	27.9§	39.6¶

^†Average of theoretical and experimental values (Mitroy et al., 2010 ▸).

^‡Average of in-crystal values (Domene et al., 1999 ▸; Holka et al., 2014 ▸).

^§Average in-crystal value (Domene et al., 1999 ▸).

^¶Estimated from the trend in ion/atom polarizability ratios for F, Cl and Br.