Table 1. Electronic Configuration for Ln IV and Ln III⁴³.

Ln	Ln IV	Ln III
La	[Cd]5p6	[Xe]5d
Ce	[Xe]4f	[Xe]5f2
Pr	[Xe]4f2	[Xe]4f3
Nd	[Xe]4f3	[Xe]4f4
Pm	[Xe]4f4	[Xe]4f5
Sm	[Xe]4f5	[Xe]4f6
Eu	[Xe]4f6	[Xe]4f7
Gd	[Xe]4f7	[Xe]4f75d
Tb	[Xe]4f8	[Xe]4f9
Dy	[Xe]4f9	[Xe]4f10
Ho	[Xe]4f10	[Xe]4f11
Er	[Xe]4f11	[Xe]4f12
Tm	[Xe]4f12	[Xe]4f13
Yb	[Xe]4f13	[Xe]4f14
Lu	[Xe]4f14	[Xe]4f147s