The melting point curve of the 3d transition series reaches a maximum at Chromium () but exhibits a — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Manganese ($Mn, 3d^5 4s^2$) has an exactly half-filled, highly stable $d^5$ configuration. The electrons are held so tightly by the nucleus that they are heavily localized and participate poorly in metallic delocalization, causing a sharp drop in melting point.