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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

Which of the following is the largest ion?

Answer: (C)

Solution

, , and are all isoelectronic (10 electrons each, neon-like), with nuclear charge increasing in the order $O(8) < F(9) < Na(11) <

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Question ID VK-133549