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

1. S < C < Al < Cs
2. S < C < Cs < Al
3. C < S < Al < Cs
4. C < S < Cs < Al

Correct answer: C < S < Al < Cs

Solution

C (~77 pm) < S (~104 pm) < Al (~143 pm) < Cs (~262 pm). Al is left of S in the same period so Al > S, and Cs is largest, giving C < S < Al < Cs.

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