Template:Infobox aluminium

Aluminium,  ₁₃Al

Template:Infobox element/symbol-to-top-image-caption
General properties
Pronunciation	Template:Infobox element/pronunciation
Alternative name	aluminum (U.S., Canada)
Appearance	silvery gray metallic
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Aluminium in the periodic table
Template:Infobox element/periodic table
Atomic number (Z)	13
Group	Template:Infobox element/group
Period	period 3
Block	p-block
Element category	Template:Infobox element/category format, sometimes considered a metalloid
Electron configuration	[Ne] 3s2 3p1
Electrons per shell	2, 8, 3
Physical properties
Phase at STP	solid
Melting point	933.47 K ​(660.32 °C, ​1220.58 °F)
Boiling point	2743 K ​(2470 °C, ​4478 °F)
Density (near r.t.)	2.70 g/cm3
when liquid (at m.p.)	2.375 g/cm3
Heat of fusion	10.71 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	284 kJ/mol
Molar heat capacity	24.20 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 1.61
[[Ionization energy|Template:Engvar energies]]	1st: 577.5 kJ/mol 2nd: 1816.7 kJ/mol 3rd: 2744.8 kJ/mol (more)
Atomic radius	empirical: 143 pm
Covalent radius	121±4 pm
Van der Waals radius	184 pm
Template:Infobox element/spectral lines
Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Speed of sound thin rod	(rolled) 5000 m/s (at r.t.)
Thermal expansion	23.1 µm/(m·K) (at 25 °C)
Thermal conductivity	237 W/(m·K)
Electrical resistivity	26.5 nΩ·m (at 20 °C)
Magnetic ordering	paramagnetic
Magnetic susceptibility	+16.5·10−6 cm3/mol
Young's modulus	70 GPa
Shear modulus	26 GPa
Bulk modulus	76 GPa
Poisson ratio	0.35
Mohs hardness	2.75
Vickers hardness	160–350 MPa
Brinell hardness	160–550 MPa
CAS Number	7429-90-5
History
Naming	after alumina (aluminium oxide), itself named after mineral alum
Prediction	Antoine Lavoisier (1782)
Discovery and first isolation	Hans Christian Ørsted (1824)
Named by	Humphry Davy (1812)
Main isotopes of aluminium
Template:Infobox element/isotopes table

Template:Infobox element/element navigation Template:Template reference list One of these is a named reference. It may be cited in the containing article as

• <ref name="CIAAW2016" /> for the source Atomic weights of the elements 2013 (from subtemplates used by {{Infobox element}})