In which of the following arrangements, the order is not correct according to the property indicated — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Step 1: Identify that Phosphorus (P) and Chlorine (Cl) both belong to the third period of the periodic table. Step 2: Moving from left to right across a period, atomic size decreases because of the steady increase in effective nuclear charge, which pulls the outer electrons closer to the nucleus. Step 3: Since Cl lies to the right of P, its single covalent radius must be smaller than that of P (i.e., less than 0.11 nm).