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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

The number of elements from the following which have valence electron(s) in the M-shell is . Si, C, N, Be, Al, S, F, B, Li, Mg, O, Ar

Answer: 5

Solution

The M-shell corresponds to , i.e. period 3 elements. From the list, the period-3 elements are Si, Al, S, Mg and Ar — 5 elements.

Question ID VK-133907