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Technical data for Strontium

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Overview
NameStrontium
SymbolSr
Atomic Number38
Atomic Weight87.62
Density2.63 g/cm3
Melting Point777 °C
Boiling Point1382 °C

Thermal properties
PhaseSolid
Melting Point777 °C
Boiling Point1382 °C
Absolute Melting Point1050 K
Absolute Boiling Point1655 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion8 kJ/mol
Heat of Vaporization137 kJ/mol
Heat of CombustionN/A
Specific Heat300 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity35 W/(m K)
Thermal Expansion0.0000225 K-1

Bulk physical properties
Density2.63 g/cm3
Density (Liquid)6.98 g/cm3
Molar Volume0.000033316
Brinell HardnessN/A
Mohs Hardness1.5 MPa
Vickers HardnessN/A
Bulk ModulusN/A
Shear Modulus6.1 GPa
Young ModulusN/A
Poisson Ratio0.28
Refractive IndexN/A
Speed of SoundN/A
Thermal Conductivity35 W/(m K)
Thermal Expansion0.0000225 K-1

Reactivity
Valence2
Electronegativity0.95
ElectronAffinity5.03 kJ/mol
Ionization Energies
549.5, 1064.2, 4138, 5.5×103, 6910, 8760, 10230, 1.18×104, 1.56×104, 1.71×104 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard Class4.2
DOT Numbers1383
EU NumberN/A
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blocks
Group2
Period5
Electron Configuration[Kr]5s2
ColorSilver
Discovery
1790 in United Kingdom
Gas phaseN/A
CAS NumberCAS7440-24-6
CID NumberCID5359327
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberN/A

Electrical properties
Electrical TypeConductor
Electrical Conductivity7.7×106 S/m
Resistivity1.3×10-7 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility1.32×10-9
Molar Magnetic Susceptibility1.16×10-10
Volume Magnetic Susceptibility3.47×10-6

Abundances
% in Universe4×10-6%
% in Sun5×10-6%
% in Meteorites0.00087%
% in Earth's Crust0.036%
% in Oceans0.00081%
% in Humans0.00046%

Atomic dimensions and structure
Atomic Radius219 pm
Covalent Radius192 pm
Van der Waals RadiusN/A
Crystal StructureFace Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
608.49, 608.49, 608.49 pm
Space Group NameFm_ 3m
Space Group Number225

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers1S0
Neutron Cross Section1.2
Neutron Mass Absorption0.0005
Known Isotopes
73Sr, 74Sr, 75Sr, 76Sr, 77Sr, 78Sr, 79Sr, 80Sr, 81Sr, 82Sr, 83Sr, 84Sr, 85Sr, 86Sr, 87Sr, 88Sr, 89Sr, 90Sr, 91Sr, 92Sr, 93Sr, 94Sr, 95Sr, 96Sr, 97Sr, 98Sr, 99Sr, 100Sr, 101Sr, 102Sr, 103Sr, 104Sr, 105Sr
Stable Isotopes
84Sr, 86Sr, 87Sr, 88Sr
Isotopic Abundances
84Sr0.56%
86Sr9.86%
87Sr7%
88Sr82.58%


Notes on the properties of Strontium:

Specific Heat: Value given for solid phase.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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