JEE Main 2022 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Main 2022

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)

(1) and Correct
(2) and Lu
(3) and
(4) and (this is also correct)

Answer: (1)

Solution

Species with the same number of electrons are isoelectronic. has 60 electrons and has 65, so they are not isoelectronic. has 63 electrons and has 65, so

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Question ID VK-034663