Connecting Chemistry


Atomic symbol: Fe
Atomic number: 26
Atomic mass: 55.85

Appearance: Metallic gray solid at 25°C

Group: 8
Period: 4
Series: Transition metals
Block: d
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²

Iron readily reacts with oxygen and water, rusting.

By mass, the most common element on Earth.

Fun Fact! The adult human body contains approximately 4 grams of iron, mostly in hemoglobin and myoglobin. It is essential to human life due to its key role in the transportation of oxygen. We obtain iron in our diet from meat, dark vegetables, fish, and more.