Technical data for Magnesium

Overview
NameMagnesium
SymbolMg
Atomic Number12
Atomic Weight24.305
Density1.738 g/cm3
Melting Point650 °C
Boiling Point1090 °C

Thermal properties
PhaseSolid
Melting Point650 °C
Boiling Point1090 °C
Absolute Melting Point923 K
Absolute Boiling Point1363 K
Heat of Fusion8.7 kJ/mol
Heat of Vaporization128 kJ/mol
Heat of Combustion-668 J/(kg K)
Specific Heat1020 J/(kg K)[note]
Thermal Conductivity160 W/(m K)
Thermal Expansion8.2×10-6 K-1

Bulk physical properties
Density1.738 g/cm3
Density (Liquid)1.584 g/cm3
Molar Volume0.000013984
Brinell Hardness260 MPa
Mohs Hardness2.5 MPa
Vickers HardnessN/A
Bulk Modulus45 GPa
Shear Modulus17 GPa
Young Modulus45 GPa
Poisson Ratio0.29
Refractive IndexN/A
Speed of Sound4602 m/s
Thermal Conductivity160 W/(m K)
Thermal Expansion8.2×10-6 K-1

Reactivity
Valence2
Electronegativity1.31
ElectronAffinity0 kJ/mol
Ionization Energies
737.7, 1450.7, 7732.7, 10542.5, 13630, 18020, 21711, 25661, 31653, 35458 kJ/mol

Health and Safety
Autoignition Point472 °C
Flashpoint500 °C
Heat of Combustion-668 J/(kg K)

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blocks
Group2
Period3
Electron Configuration[Ne]3s2
ColorSilver
Discovery
1755 in United Kingdom
Gas phaseN/A
CAS NumberCAS7439-95-4

Electrical properties
Electrical TypeConductor
Electrical Conductivity2.3×107 S/m
Resistivity4.4×10-8 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility6.9×10-9
Molar Magnetic Susceptibility1.68×10-10
Volume Magnetic Susceptibility0.000012

Abundances
% in Universe0.06%
% in Sun0.07%
% in Meteorites12%
% in Earth's Crust2.9%
% in Oceans0.13%
% in Humans0.027%

Atomic dimensions and structure
Atomic Radius145 pm
Covalent Radius130 pm
Van der Waals Radius173 pm
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
320.94, 320.94, 521.08 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
24Mg, 25Mg, 26Mg
Isotopic Abundances
24Mg78.99%
25Mg10%
26Mg11.01%

Notes on the properties of Magnesium:
Specific Heat: Value given for solid phase.