Magnesium
12Mg
Be ↑ Mg ↓ Ca Periodic table sodium ← magnesium → aluminium
Panagway
shiny grey solid Spectral lines of Magnesium
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	magnesium, Mg, 12
Paglitok	[[Help:Pronunciation respelling key|mag-Plantilya:Smallcaps all-zee-əm]]
Kategoriyang elemento	alkaline earth metal
Group, period, block	2, 3, s
Gibug-aton sa atomo	24.3050(6)
Kontorno sa elektron	[Ne] 3s2 2, 8, 2
History
Pagkadiskobre	Joseph Black (1755)
First isolation	Humphry Davy (1808)
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
Molar heat capacity	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
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	160 pm
Covalent radius	141±7 pm
Van der Waals radius	173 pm
Miscellanea
Crystal structure	hexagonal close-packed
Magnetic ordering	paramagnetic
Electrical resistivity	(20 °C) 43.9 nΩ·m
Thermal conductivity	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
Most stable isotopes
Main article: Isotopes of magnesium
iso NA half-life DM DE (MeV) DP 24Mg 78.99% 24Mg is stable with 12 neutrons 25Mg 10.00% 25Mg is stable with 13 neutrons 26Mg 11.01% 26Mg is stable with 14 neutrons
v t e · r

Ang magnesyo ay ang elementong kimiko nga naa sa periodic table na may simbolo kimiko na Mg og atomic number nga 12. Ang magnesyum ay ang ika-otso nga pinakadaghan sa kalibutan

1. ↑ Bernath, P. F., Black, J. H., & Brault, J. W. (1985). "The spectrum of magnesium hydride" (PDF). Astrophysical Journal. 298: 375. Bibcode:1985ApJ...298..375B. doi:10.1086/163620.{{cite journal}}: CS1 maint: multiple names: authors list (link)