HHomeBackground Color:He
LiBeBeryllium Main PageBlack White GrayBCNOFNe
NaMgBeryllium Pictures PageAlSiPSClAr
KCaBeryllium Isotope DataScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRn
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Technical data for Beryllium

Click any property name to see plots of that property for all the elements.

Overview
NameBeryllium
SymbolBe
Atomic Number4
Atomic Weight9.012182
Density1.848 g/cm3
Melting Point1287 °C
Boiling Point2470 °C

Thermal properties
PhaseSolid
Melting Point1287 °C
Boiling Point2470 °C
Absolute Melting Point1560 K
Absolute Boiling Point2743 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion7.95 kJ/mol
Heat of Vaporization297 kJ/mol
Heat of CombustionN/A
Specific Heat1820 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity190 W/(m K)
Thermal Expansion0.0000113 K-1

Bulk physical properties
Density1.848 g/cm3
Density (Liquid)1.69 g/cm3
Molar Volume4.8767×10-6
Brinell Hardness600 MPa
Mohs Hardness5.5 MPa
Vickers Hardness1670 MPa
Bulk Modulus130 GPa
Shear Modulus132 GPa
Young Modulus287 GPa
Poisson Ratio0.032
Refractive IndexN/A
Speed of Sound1.3×104 m/s
Thermal Conductivity190 W/(m K)
Thermal Expansion0.0000113 K-1

Reactivity
Valence2
Electronegativity1.57
ElectronAffinity0 kJ/mol
Ionization Energies
899.5, 1757.1, 14848.7, 21006.6 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard Class6.1
DOT Numbers1567
EU NumberN/A
NFPA Fire Rating1
NFPA HazardsN/A
NFPA Health Rating3
NFPA Reactivity Rating0
RTECS NumberRTECSDS1750000
NFPA LabelNFPA Label

Classifications
Alternate NamesNone
Names of AllotropesNone
Blocks
Group2
Period2
Electron Configuration[He]2s2
ColorSlateGray
Discovery
1797 in France
Gas phaseN/A
CAS NumberCAS7440-41-7
CID NumberCID5460467
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberRTECSDS1750000

Electrical properties
Electrical TypeConductor
Electrical Conductivity2.5×107 S/m
Resistivity4×10-8 m Ω
Superconducting Point0.026

Magnetic properties
Magnetic TypeDiamagnetic
Curie PointN/A
Mass Magnetic Susceptibility-1.26×10-8
Molar Magnetic Susceptibility-1.136×10-10
Volume Magnetic Susceptibility-0.00002328

Abundances
% in Universe1×10-7%
% in Sun1×10-8%
% in Meteorites2.9×10-6%
% in Earth's Crust0.00019%
% in Oceans6×10-11%
% in Humans4×10-8%

Atomic dimensions and structure
Atomic Radius112 pm
Covalent Radius90 pm
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
228.58, 228.58, 358.43 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers1S0
Neutron Cross Section0.0092
Neutron Mass Absorption0.00003
Known Isotopes
5Be, 6Be, 7Be, 8Be, 9Be, 10Be, 11Be, 12Be, 13Be, 14Be, 15Be, 16Be
Stable Isotopes
9Be
Isotopic Abundances
9Be100%


Notes on the properties of Beryllium:

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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