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Question

The correct order of atomic radii among the following elements is:

A
S<Cl<Ar
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B
Ar<S<Cl
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C
Cl<S<Ar
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D
Ar<Cl<S
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Solution

The correct option is C Cl<S<Ar
As we move from left to right, atomic radii decrease due to increse in effective nuclear charge (Zeff).
Noble gases have highest size in the period because they have van der Waals' radius, which is always greater than covalent radius.
Therefore, correct order of radii is: Cl<S<Ar

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