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< Back Zirconium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 40 Atomic Symbol Zr Atomic Weight 91.224 amu Group Transition, 4 Form Solid Density @ STP 6.52 g/cm3 Melting Point 1855 °C (3371 °F, 2128.15 °K) Boiling Point 4409 °C (7968.2 °F, 4682.15 °K) Heat of Fusion 21.00 kJ/mol Heat of Vaporization 580 kJ/mol First Ionization Potential 6.63390 eV Electronegativity (on Pauling scale) 1.33 Specific Heat Capacity 0.278 J/g K Ground State Electron Configuration 4d2 5s2 Oxidation States +4 Stable Isotopes and Natural Abundance on Earth 90Zr, 51.45%; 91Zr, 11.22%; 92Zr, 17.15%; 94Zr, 17.38%; 96Zr, 2.08% Selected Radioisotopes 88Zr, 95Zr Atomic Radius 206 pm Crystal Structure Hexagonal Discovered by Klaproth, 1789

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