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  1. Allotropessee Allotropes of iron
    Appearancelustrous metallic with a grayish tinge
    Phase at STPsolid
    Melting point1811 K (1538 °C, 2800 °F)
    Characteristics

    At least four allotropes of iron (differing atom arrangements in the solid) are known, conventionally denoted α, γ, δ, and ε.
    The first three forms are observed at ordinary pressures. As molten iron cools past its free… See more

    Origin and occurrence in nature

    Iron's abundance in rocky planets like Earth is due to its abundant production during the runaway fusion and explosion of type Ia supernovae, which scatters the iron into space.
    Metallic or … See more

    Chemistry and compounds

    Iron shows the characteristic chemical properties of the transition metals, namely the ability to form variable oxidation states differing by steps of one and a very large coordination and organometallic chemistry: indeed, it w… See more

    History

    Iron is one of the elements undoubtedly known to the ancient world. It has been worked, or wrought, for millennia. However, iron artefacts of great age are much rarer than objects made of gold or silver due to the ease wi… See more

     
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