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< Back Strontium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 38 Atomic Symbol Sr Atomic Weight 87.62 amu Group Alkaline Earth, 2 Form Solid Density @ STP 2.64 g/cm3 Melting Point 777 °C (1430.6 °F, 1050.15 °K) Boiling Point 1382 °C (2519.6 °F, 1655.15 °K) Heat of Fusion 7.43 kJ/mol Heat of Vaporization 137 kJ/mol First Ionization Potential 5.69484 eV Electronegativity (on Pauling scale) 0.95 Specific Heat Capacity 0.301 J/g K Ground State Electron Configuration 5s2 Oxidation States +2 Stable Isotopes and Natural Abundance on Earth 84Sr, 0.56%; 86Sr, 9.86%; 87Sr, 7.00%; 88Sr, 82.58% Selected Radioisotopes 82Sr, 85Sr, 89Sr, 90Sr Atomic Radius 219 pm Crystal Structure Cubic Discovered by Crawford, 1790

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