Element

Atomic Number

Electronic Configuration

Ionic Radius trivalent (nm)

Ionic Radius

Monovalent (nm)

Al

13

[Ne] 3s² 3p¹

0.0535

--

Ga

31

[Ar] 3d¹⁰4s²4p¹

0.0620

0.12

In

49

[Kr]4d¹⁰5s²5p¹

0.0800

0.14

Tl

81

[Xe] 4f¹⁴5d¹⁰6s²6p¹

0.0885

0.05