A, B, C are three elements with atomic numbers, Z-1, Z, and Z+1 respectively. B is an inert gas.
Identify the group to which A and C belong.

Alkali metal, Alkaline earth metal

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Halogen, Alkali metal

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Inert gas, Alkali metal

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Halogens, Inert gas

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Solution

The correct option is C Halogen, Alkali metal
As compared to B, the atomic number of A is less by one unit. A contains one electron less than than nearest inert gas. Hence, A is a halogen. As compared to B, the atomic number of C is more by one unit. C contains one electron more than than nearest inert gas. Hence, C is a alkali metal.

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