Question

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

Answer 1

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: $Cl<S<Ar$