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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

In which one of the following pairs the radius of the second species is greater than that of the first? [Manipal 2010]

Answer: (B)

Solution

and are isoelectronic; since N (Z=7) has a lower nuclear charge than O (Z=8), is larger than , so the second species here is indeed larger than the first. In the other pairs the second species is always smaller than the first: Mg is

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Question ID VK-133172