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< Back Hafnium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 72 Atomic Symbol Hf Atomic Weight 178.49 amu Group Transition, 4 Form Solid Density @ STP 13.3 g/cm3 Melting Point 2233 °C (4051.4 °F, 2506.15 °K) Boiling Point 4603 °C (8317.4 °F, 4876.15 °K) Heat of Fusion 27.2 kJ/mol Heat of Vaporization 630 kJ/mol First Ionization Potential 6.82507 eV Electronegativity (on Pauling scale) 1.3 Specific Heat Capacity 0.144 J/g K Ground State Electron Configuration 5d2 6s2 Oxidation States +4 Stable Isotopes and Natural Abundance on Earth 174Hf, 0.162%; 176Hf, 5.206%; 177Hf, 18.606%; 178Hf, 27.297%; 179Hf, 13.629%; 180Hf, 35.100% Selected Radioisotopes 172Hf Atomic Radius 208 om Crystal Structure Hexagonal Discovered by Coster; Charles von Hevesy, 1923

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