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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

The atomic symbols of some elements are given below: Si, C, Al, S, F, B, Li, Mg, O The number of elements from the above having atomic radius smaller than Cl is .

Answer: 5

Solution

Si, Al, S and Mg are period-3 elements that lie to the left of Cl in the same period, so they have a *larger* radius than Cl, not smaller. The period-2

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Question ID VK-133896