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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

An isoelectronic pair among the following is **[UP SEE 2008]**

Answer: (B)

Solution

Ar has 18 electrons. has electrons, matching Ar. K has 19 electrons and Ca has 20 (neutral), so (a) and (d) are not

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Question ID VK-132141