Iron: Twenty-Six Protons
The advanced companion to the Ferro song: real facts about iron, a transition metal whose hemoglobin binds oxygen in blood, whose ferromagnetism makes magnets work, whose rust is iron oxide, and whose liquid outer core generates Earth's whole magnetic field.
Twenty-six protons make iron, a metal steady and gray, forged inside dying stars before our sun found its way. Deep in your blood a molecule called hemoglobin waits, one iron atom cradles oxygen, carrying it through your veins. Breathe in, the iron catches oxygen tight in its hold, exhale carbon dioxide, the story always retold. Line up two magnets near a chunk of iron and watch it turn, its atoms lock their spins together, that is how magnets learn. Leave iron in the rain too long, water and oxygen creep, rust grows red and flaking, an oxide slow and deep. Six thousand kilometers under your feet, a molten sea churns wide, liquid iron and nickel, swirling on the planet's inside. That churning current, combined with the spin of the Earth each day, builds the magnetic field that turns a compass needle your way. Mix iron with carbon, and you forge a metal called steel, strong enough for bridges and rails, for buildings and for wheels. Fourth most common element found in the crust below your feet, but the core beneath is iron and nickel, dense and complete.
Key Concepts: Iron — element 26, transition metal | The heme group in hemoglobin holds one iron atom that reversibly binds oxygen, carrying it through the blood | Ferromagnetic — its atoms align their magnetic spins, letting iron become or attract a magnet | Rust is hydrated iron oxide, formed when iron reacts with water and oxygen | Earth's liquid iron-nickel outer core, churning and spinning, generates the planet's magnetic field | Alloyed with carbon to make steel
Advanced companion to: I'm Ferro — same educational content (magnet, blood, Earth's core, rust, bridges and trains), sung directly about the real element as a plain narrative for an older audience.