1.

Which of the following ions have half & completely filled f-orbital respectively in lanthanides ions?[Given Atomic No : Eu-63, Sm-62, Tm-69, Tb-65, Yb-70, Dy-66](a) Eu2+, Tm2+(b) Tb4+, Yb2+(c) Dy3+, Yb3+(d) Sm2+, Tm3+

Answer»

Correct option is (b) Tb4+, Yb2+

Electronic configuration of Tb4+ = [Xe] 4f7 and for Yb2+ = [Xe] 4fI4



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