Template:Infobox magnesium

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12 sodiummagnesiumaluminium
Be

Mg

Ca
Magnesium in the periodic table of the elements
General
Name, symbol, number magnesium, Mg, 12
Element category alkaline earth metals
Group, period, block 23, s
Appearance silvery white solid at room temp
Standard atomic weight 24.3050(6)g·mol−1
Electron configuration Ne 3s2
Electrons per shell 2, 8, 2
Physical properties
Phase solid
Density (near r.t.) 1.738 g·cm−3
Liquid density at m.p. 1.584 g·cm−3
Melting point 923 K
(650 °C, 1202 °F)
Boiling point 1363 K
(1091 °C, 1994 °F)
Heat of fusion 8.48 kJ·mol−1
Heat of vaporization 128 kJ·mol−1
Specific heat capacity (25 °C) 24.869 J·mol−1·K−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K 701 773 861 971 1132 1361
Atomic properties
Crystal structure hexagonal
Oxidation states 2, 1 [1]
(strongly basic oxide)
Electronegativity 1.31 (Pauling scale)
Ionization energies
(more)
1st: 737.7 kJ·mol−1
2nd: 1450.7 kJ·mol−1
3rd: 7732.7 kJ·mol−1
Atomic radius 150 pm
Atomic radius (calc.) 145 pm
Covalent radius 130 pm
Van der Waals radius 173 pm
Miscellaneous
Magnetic ordering paramagnetic
Electrical resistivity (20 °C) 43.9 nΩ·m
Thermal conductivity (300 K) 156 W·m−1·K−1
Thermal expansion (25 °C) 24.8 µm·m−1·K−1
Speed of sound (thin rod) (r.t.) (annealed)
4940 m·s−1
Young's modulus 45 GPa
Shear modulus 17 GPa
Bulk modulus 45 GPa
Poisson ratio 0.290
Mohs hardness 2.5
Brinell hardness 260 MPa
CAS registry number 7439-95-4
Selected isotopes
Main article: Isotopes of magnesium
iso NA half-life DM DE (MeV) DP
24Mg 78.99% 24Mg is stable with 12 neutrons
25Mg 10% 25Mg is stable with 13 neutrons
26Mg 11.01% 26Mg is stable with 14 neutrons
References
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