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The d-and f-Block Elements
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28/03/2022 9:48 pm
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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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28/03/2022 9:52 pm
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.