Element Aluminum

Aluminum ElementAluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13.
It is a silvery-white, soft, non-magnetic and ductile metal in the boron group.
By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below.
Aluminum powder, coated appears as a light gray or silver powdered metal. Easily ignited; burns with an intense flame.

Names and Identifiers

Chemical Formula:Al
CAS:7429-90-5
Molecular Weight:30.00540 g/mol
EC Number :231-072-3
MDL Number:MFCD00134029
Color:silvery
Other Names:Aluminium; Alluminio
PubChem CID:5359268
IUPAC Name:Aluminium
Inchl:InChI=1S/Al
InChI Key:XAGFODPZIPBFFR-UHFFFAOYSA-N
Canonical SMILES:[Al]
ICSC Number:0988

Physical & Chemical Properties

Phase:Solid
Density:2.70 g/cm3
Boiling Point:2743 K ​(2470 °C, ​4478 °F)
Melting Point:933.47 K ​(660.32 °C, ​1220.58 °F)
Molecular Formula:Al
Flash Point:400°C
Exact Mass:30.00500
Symbol:Globally Harmonized System of Classification
Signal Word:Warning
Hazard Statements:H400
Precautionary Statements:P273
Hazard Codes:F:Highlyflammable;
Risk Phrases:R15;R17
Safety Phrases:S43-S7/8
RIDADR:UN 1396
WGK Germany:3
RTECS:BD0330000
Packaging Group:III
Hazard Class:8

It is the only aluminium isotope that has existed on Earth in its current form since the creation of the planet. Very nearly all the element on Earth is present as this isotope, which makes aluminium a mononuclidic element and means that its standard atomic weight practically equates to that of the isotope.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
27Al26.9815386 (8)1005/23.641504

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
24Al23.9999412.07 sEC + α to 20Ne; EC to 24Mg43.646
25Al24.9904297.17 sEC to 25Mg5/2
26Al25.986892710000 yEC to 26Mg5
28Al27.9819102.25 mβ to 28Si33.24
29Al28.9804466.5 mβ to 29Si5/2
30Al29.982963.68 sβ to 30Si3

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