Question

The atomic number of elements A, B and C are (Z - 1), Z and (Z + 1) respectively. B is an inert gas (not helium). What is the group number of element A?

Medium

Solution

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Correct option is A)

'B' belongs to noble gas family or 18th group. The element having atomic number less than that of inert gas belongs to group. 

Thus, belongs to group.

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