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    Fe

    Iron

    Transition Metal

    Atomic Number: 26 • Atomic Mass: 55.8450 u • Period: 4 • Group: 8

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶
    Phase: Solid
    Electronegativity: 1.83
    Manganese (Mn)Cobalt (Co)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Occurrence

    Iron is found in various natural sources, including minerals, rocks, and the Earth's crust.

    • Fourth most common element in Earth's crust (5.6%)
    • Second most abundant metal after aluminum
    • Believed to make up much of Earth's core
    • Found in many minerals including hematite, magnetite, and siderite
    • Found in meteorites, often as iron-nickel alloy