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< Back Molybdenum  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 42 Atomic Symbol Mo Atomic Weight 95.94 amu Group Transition, 6 Form Solid Density @ STP 10.2 g/cm3 Melting Point 2623 °C (4753.4 °F, 2896.15 °K) Boiling Point 4639 °C (8382.2 °F, 4912.15 °K) Heat of Fusion 37.48 kJ/mol Heat of Vaporization 600 kJ/mol First Ionization Potential 7.09243 eV Electronegativity (on Pauling scale) 2.16 Specific Heat Capacity 0.251 J/g K Ground State Electron Configuration 4d5 5s1 Oxidation States +6 Stable Isotopes and Natural Abundance on Earth 92Mo, 14.84%; 94Mo, 9.25%; 95Mo, 15.92%; 96Mo, 16.68%; 97Mo, 9.55%; 98Mo, 24.13%; 100Mo, 9.63% Selected Radioisotopes 99Mo Atomic Radius 190 pm Crystal Structure Cubic Discovered by Scheele, 1781

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