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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

Which one of the following ions has the highest value of ionic radius?

Answer: (C)

Solution

and are both 2-electron (helium-like) species confined to the first shell, making them much smaller than the 10-electron (neon-like), second-shell

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Question ID VK-133201