Al Atomic Mass

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Atomic Mass of Aluminium Atomic mass of Aluminium is 26.9815 u. Molar mass calculations are explained and there is a JavaScript calculator to aid calculations. Chemical Database This database focuses on the most common chemical compounds used in the home and industry. Citing this page. If you need to cite this page, you can copy this text: Kenneth Barbalace. Periodic Table of Elements - Aluminum - Al. The Commission last revised the standard atomic weight of aluminium in 2017 based on the latest Atomic Mass Evaluation by IUPAP. 26 Al is radioactive with a half-life of 0.705 (24) Ma, too short for survival of a detectable amount of primordial isotope. However, 26 Al is recognized as a spallation product of argon from cosmic rays.

IsotopeAtomic mass (Da)Isotopic abundance (amount fraction)
27Al26.981 5384(3)1

Al: 13 - Covalenz radius: 28.0855: Silicon: Si: 14 - Ionization energy: 30.9738: Phosphorus: P: 15: For chemistry students and teachers: The tabular chart on the right is arranged by Atomic mass (weight). The lightest chemical element is Hydrogen and the heaviest is Hassium. The unity for atomic mass is gram per mol. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Finding molar mass starts with units of grams per mole (g/mol).


Atomic mass list

Aluminium is a monoisotopic element and its atomic weight is determined solely by its isotope 27Al. The Commission last revised the standard atomic weight of aluminium in 2017 based on the latest Atomic Mass Evaluation by IUPAP.

Aluminum

26Al is radioactive with a half-life of 0.705(24) Ma, too short for survival of a detectable amountof primordial isotope. However, 26Al is recognized as a spallation product of argon from cosmic rays. In addition,secondary cosmic rays including muons interact with Si-bearing rocks to produce 26Al in measurableamounts, but far below levels that would affect the atomic-weight value in normal materials.

Al Atomic Mass Number

Al Atomic MassAtomic

27Al is the most abundant isotope in the earth's crustal rocks with an uneven atomic number.

SOURCEAtomic weights of the elements: Review 2000 by John R de Laeter et al. Pure Appl. Chem. 2003 (75) 683-800
© IUPAC 2003

Al Atomic Mass Rounded

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Al Atomic Mass

Aluminium
Ar(Al) = 26.981 5384(3) since 2017
The name derives from the Latin, alum and alumen for 'stringent' because the early Romans called anysubstance with a stringent taste alum. The element was known in prehistoric times. In 1825, the Danishphysicist, Hans Christian Oersted, isolated impure aluminium. The pure metal was first isolated by theGerman chemist Friedrich Wöhler in 1827.