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Question:

The correct order of the atomic radii of C, Cs, Al, and S is:

S < C < Al < Cs

C < S < Al < Cs

S < C < Cs < Al

C < S < Cs < Al

Solution:

Atomic radii order : C < S < Al < Cs
Atomic radius of C : 170 pm
Atomic radius of S : 180 pm
Atomic radius of Al : 184 pm
Atomic radius of Cs : 300 pm