Question

please give the answer of this question step by step with explanation that how you reached the answer

Answer 1

The question is incomplete firstly.

Step-by-step explanation:

If you consider Atomic radius, then

Noble gases have largest atomic radius , Halogens have smallest atomic radius and the atomic radius then increases as we go from right to left across the period .

Alternately we can say , atomic radius decreases as we progress across a period but noble gases are an exception and they have the largest atomic radius.

∴ Ar has largest atomic radius as it belongs to noble gases followed by Cs as it belongs to first group , then Sr which belongs to second group and finally F which belongs to halogen group .

Here we consider variation of atomic radius across a period only , since they belong to different groups and do not consider variation of atomic radius down a group.