Which property decreases from left to right across the periodic table and increases from top to bott — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Step 1: Analyze the periodic trends of each property listed: (i) Atomic radius, (ii) Electronegativity, (iii) Ionisation energy, and (iv) Metallic character. Step 2: Atomic radius and metallic character decrease across a period due to increasing effective nuclear charge and increase down a group due to increasing number of shells. Electronegativity and ionisation energy increase across a period and decrease down a group. Step 3: Thus, only properties (i) and (iv) decrease from left to right and increase from top to bottom, corresponding to option (d).