The melting point curve of the 3d transition series elements shows a progressive increase up to Chro — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Manganese ($3d^5 4s^2$) has an exactly half-filled $d$ -subshell which is so highly stable that its electrons are tightly held and participate poorly in delocalized metallic bonding, causing a sharp dip in melting point.