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Name the members of the lanthanoid series which exhibit +4 oxidation state and those which exhibit +2 oxidation state. Try to correlate this type of behavior with the electronic configurations of these elements.

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Name the members of the lanthanoid series which exhibit +4 oxidation state and those which exhibit +2 oxidation state. Try to correlate this type of behavior with the electronic configurations of these elements.

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The lanthanides that exhibit +2 and +4 states are shown in the given table. The atomic numbers of the elements are given in the parenthesis.

+2  →  +4

Nd (60) → Ce(58)

Sm (62) → Pr (59)

Eu (63) → Nd (60)

Tm (69) → Tb (65)

Yb (70) → Dy (66)

Ce after forming Ce4+ attains a stable electronic configuration of [Xe].

Tb after forming Tb4+ attains a stable electronic configuration of [Xe]4f7.

Eu after forming Eu2+ attains a stable electronic configuration of [Xe] 4f7.

Yb after forming Yb2+ attains a stable electronic configuration of [Xe] 4f14.

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