Question

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

• A. $S<Cl<Ar$
• B. $Ar<S<Cl$
• C. $Cl<S<Ar$
• D. $Ar<Cl<S$

Answer 1

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 $\left(Z_{eff}\right)$.
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: $Cl<S<Ar$