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31-01-2024
Chemistry

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Which of the following pair is not isoelectronic species?

(At. no. Sm, 62; Er, 68: Yb, 70: Lu, 71; Eu, 63: Tb, 65; Tm, 69)

(A) Sm²⁺ and Er³⁺
(B) Yb²⁺ and Lu³⁺
(C) Eu²⁺ and Tb⁴⁺
(D) Tb²⁺ and Tm⁴⁺

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