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The standard atomic weight of aluminium is low in comparison with many other metals. [c] ... In contrast, the Earth's mantle is only 2.38% aluminium by mass. [67]
Only 27 Al (stable isotope) and 26 Al (radioactive isotope, t 1/2 = 7.2 × 10 5 y) occur naturally, however 27 Al comprises nearly all natural aluminium. Other than 26 Al, all radioisotopes have half-lives under 7 minutes, most under a second. The standard atomic weight is 26.981 5385 (7).
The standard atomic weight (A r °(Cu)) for copper is the average, weighted by their natural abundance, and then divided by the atomic mass constant m u. [ 1 ] The standard atomic weight of a chemical element (symbol A r °(E) for element "E") is the weighted arithmetic mean of the relative isotopic masses of all isotopes of that element ...
atomic mass Electronegativity (Pauling) First Ionization Energy Radii Valence electrons; Atomic Van der Waals ... Aluminium: Al: 26.9815386(8) 1.61: 5.98577: 125 ...
The atomic mass (relative isotopic mass) is defined as the mass of a single atom, which can only be one isotope (nuclide) at a time, and is not an abundance-weighted average, as in the case of relative atomic mass/atomic weight. The atomic mass or relative isotopic mass of each isotope and nuclide of a chemical element is, therefore, a number ...
Molar mass: 101.960 g·mol ... Aluminium oxide ... where the conformal growth of a thin film is a prerequisite and the preferred growth mode is atomic layer ...
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Examples of such atomic properties include: partly filled d-or f- orbitals (in many of the transition, lanthanide, and actinide heavy metals) that enable the formation of coloured compounds; [120] the capacity of heavy metal ions (such as platinum, [121] cerium [122] or bismuth [123]) to exist in different oxidation states and are used in ...