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Aluminium (or aluminum in North American English) is a chemical element; it has symbol Al and atomic number 13. Aluminium has a density lower than that of other common metals, about one-third that of steel. It has a great affinity towards oxygen, forming a protective layer of oxide on the surface when exposed to air.
In chemistry, the molar mass (M) (sometimes called molecular weight or formula weight, but see related quantities for usage) of a chemical compound is defined as the ratio between the mass and the amount of substance (measured in moles) of any sample of the compound. [1] The molar mass is a bulk, not molecular, property of a substance.
Powdered aluminium shares many of the physical characteristics of bulk aluminium such as its molecular weight of 26.981538 g mol −1, [3] melting point of 660 °C, [4] and a boiling point of 2460 °C.
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).
Molar mass: 101.960 g·mol −1 Appearance white solid ... Aluminium oxide (or aluminium(III) oxide) is a chemical compound of aluminium and oxygen with the chemical ...
Molar mass: 78.003 g·mol −1 Appearance ... Aluminium hydroxide, Al 3, ... International Chemical Safety Card 0373
2 O, where X is an alkali metal or ammonium, Y is a trivalent metal, and n often is 12. The most important example is chrome alum, KCr(SO 4) 2 ·12 H 2 O, a dark violet crystalline double sulfate of chromium and potassium, was used in tanning. In general, alums are formed more easily when the alkali metal atom is larger.
Molar mass: 212.996 g/mol (anhydrous) 375.134 g/mol (nonahydrate) Appearance White crystals, solid ... Aluminium nitrate is a white, ...