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< Back Iron  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 26 Atomic Symbol Fe Atomic Weight 55.854 amu Group Transition, 8 Form Solid Density @ STP 7.87 g/cm3 Melting Point 1538 °C (2800.4 °F, 1811.2 °K) Boiling Point 2861 °C (5181.8 °F, 3134.2 °K) Heat of Fusion 13.81 kJ/mol Heat of Vaporization 347 kJ/mol First Ionization Potential 7.9024 eV Electronegativity (on Pauling scale) 1.83 Specific Heat Capacity 0.449 J/g K Ground State Electron Configuration 3d6 4s2 Oxidation States +2, +3 Stable Isotopes and Natural Abundance on Earth 54Fe, 5.8%; 56Fe, 91.72%; 57Fe, 2.1%; 58Fe, 0.28% Selected Radioisotopes 52Fe; 55Fe; 59Fe Atomic Radius 156 pm Crystal Structure Cubic

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