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Strontium

Metalsolid
Symbol: Sr
Atomic number: 38
Atomic mass: 87.62
Group: Alkali Earth Metal
CAS-number: 7440-24-6

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Physical data
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 8, 2
Orbitals: [Kr] 5s2
Electronegativity: 1.0, 1.0
1. Ionization potential: 5.6948 eV
2. Ionization potential: 11.03 eV
3. Ionization potential: 43.60 eV
Oxidation states: 2
Electrical conductivity: 0.0762 10^6
Melting point: 769 °C
Boiling point: 1384 °C
Specific heat: 0.30 J/gK
Heat of fusion: 8.30 kJ/mol
Heat of vaporization: 144.0 kJ/mol
Thermal conductivity: 0.353 W/cmK
Atomic radius: 2.45 Å
Ionic radius: 1.26 Å (+2)
Covalent radius: 1.91 Å
Atomic volume: 33.7 cm³/mol
Density (293 K): 2.6 g/cm³
Crystal structure: cubic face centered
cubic face centered

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
82Sr 0 82 0 25.36d EC View
83Sr 0 83 7/2 1.350d EC, β+ View
84Sr 0.56 83.9134 0 -- --
85Sr 0 84.913 9/2 64.84d EC View
85Srm 0 85 1/2 1.27h IT, EC View
86Sr 9.86 85.9093 0 -- --
87Sr 7.02 86.9089 9/2 -- --
87Srm 0 87 1/2 2.80h IT, EC View
88Sr 82.56 87.9056 0 -- --
89Sr 0 88.907 5/2 50.52d β- View
90Sr 0 89.907 0 29.1y β- View
91Sr 0 91 5/2 9.50h β-, β- View
92Sr 0 92 0 2.71h β- View
93Sr 0 93 5/2 7.4m β- View

Other info

Name origin:From the Scottish town, Strontian
Description:Soft, malleable, silvery-yellow metal.
Discovered by:A. Crawford
Year:1790
Place:Scotland
Sources:Found in minerals celestite and strontianite.
Use(s):Used in flares and fireworks for crimson color. Strontium-90 is a long lived highly radioactive fallout product of atomic-bomb explosions.