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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

Which represents a collection of isoelectronic species?

Answer: (D)

Solution

(7+3=10), (9+1=10) and (11−1=10) each have exactly 10 electrons, so they are isoelectronic. Checking the others: (4),

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Question ID VK-133576