Technical data for Strontium

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
Heat of Fusion8 kJ/mol
Heat of Vaporization137 kJ/mol
Heat of CombustionN/A
Specific Heat300 J/(kg K)[note]
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
Mohs Hardness1.5 MPa
Shear Modulus6.1 GPa
Poisson Ratio0.28
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

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blocks
Group2
Period5
Electron Configuration[Kr]5s2
ColorSilver
Discovery
1790 in United Kingdom
Gas phaseN/A
CAS NumberCAS7440-24-6

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 Susceptibility-2.5×10-9
Molar Magnetic Susceptibility-2.19×10-10
Volume Magnetic Susceptibility-6.58×10-6

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
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.