Consider the transition elements of the , , and series. Which of the following statements are CORREC — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

The $5d$ elements have a higher $Z_{eff}$ because of the extremely poor shielding provided by the deeply buried $4f$ electrons, making their outer electrons tightly held and raising their IE over the $3d/4d$ series. $Pt$ ($5d$) > $Pd$ ($4d$). Statement C is incorrect because transition metals do not smoothly decrease in IE down a group; $5d$ is typically higher than both $3d$ and $4d$.