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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

Which among the following species have the same number of electrons in its outermost as well as penultimate shell?

Answer: (D)

Solution

has electron arrangement — 8 electrons in the outermost (3rd) shell and 8 in the penultimate (2nd) shell, which are equal.

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Question ID VK-132318