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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

Which of the following isoelectronic ions has lowest ionisation energy?

Answer: (D)

Solution

and are isoelectronic (18 electrons, Ar-core); the one with the lowest nuclear charge is the largest and most loosely bound, hence easiest to ionise.

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Question ID VK-133257