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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

Which one of the following groupings represents a collection of isoelectronic species? (At. no. Cs=55, Br=35) **[AIEEE 2003]**

Answer: (B)

Solution

Isoelectronic species have the same number of electrons. has electrons, has electrons, and has electrons — all three have 10 electrons. In option

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Question ID VK-132125