JEE Main 2022 (Online) 28th July Evening Shift | d and f Block Elements Question 109 | Chemistry

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JEE Main 2022 (Online) 28th July Evening Shift

MCQ (More than One Correct Answer)

-1

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)

$$\mathrm{Sm}^{2+}$$ and $$\mathrm{Er}^{3+}$$

$$\mathrm{Yb}^{2+}$$ and $$\mathrm{Lu}^{3+}$$

$$\mathrm{Eu}^{2+}$$ and $$\mathrm{Tb}^{4+}$$

$$\mathrm{Tb}^{2+}$$ and $$\mathrm{Tm}^{4+}$$

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