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< Back Chromium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 24 Atomic Symbol Cr Atomic Weight 51.9961 amu Group Transition, 6 Form Solid Density @ STP 7.15 g/cm3 Melting Point 1907 °C (3464.6 °F, 2180.2 °K) Boiling Point 2671 °C (4839.8 °F, 2944.2 °K) Heat of Fusion 21.0 kJ/mol Heat of Vaporization 339 kJ/mol First Ionization Potential 6.76664 eV Electronegativity (on Pauling scale) 1.66 Specific Heat Capacity 0.449 J/g K Ground State Electron Configuration 3d5 4s1 Oxidation States +2, +3, +6 Stable Isotopes and Natural Abundance on Earth 50Cr, 4.345%; 52Cr, 83.789%; 53Cr, 2.365%; 54Cr, 2.365% Selected Radioisotopes 51Cr Atomic Radius 166 pm Crystal Structure Cubic Discovered by Vauquelin, 1797

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