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Metal > IronFe - Iron The Iron Age was underway by 1000 BC; since then, the history of our technology based civilization has been the history of iron. Iron's strength was its first virtue and it's ferromagnetic properties are a gift. Iron is not without drawbacks, however. When in the presence of water, iron readily reacts with oxygen, making rust: a brittle, flimsy, red powder which is mostly useless. Our students are familiar with iron III chloride, the yellow liquid used in general chemistry as a source of iron ions, staples and filings are used for the metal. Atomic number - 26 Density g/mL 7 .86 Atomic weight u 55 .847 Melting point K 1809 Bonding radius A 1 .17 Boiling point K 3135 Atomic radius A 1 .72 Heat of vaporization kJ/mol 349 .6 Ionization Potential V 7 .87 Heat of fusion kJ/mol 13 .8 Electronegativity - 1 .83 Specific heat J/gK 0 .44 The oxide is amphoteric. Crystal are body centered cubic. Electron config. : [Ar] 3d6 4s2 Definition: The term iron, as used in the chemical or scientific sense of the word, refers to the chemical element iron or pure iron and is the chief constituent of all commercial iron and steel.
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