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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.
Several group 13 elements have biological roles in the ecosystem. Boron is a trace element in humans and is essential for some plants. Lack of boron can lead to stunted plant growth, while an excess can also cause harm by inhibiting growth. Aluminium has neither a biological role nor significant toxicity and is considered safe.
Aluminium: The Thirteenth Element (Russian: Алюминий. Тринадцатый элемент) is a Russian encyclopedia completely devoted to aluminium.The encyclopedia is published by United Company RUSAL, at the end of 2007, in both Russian and English.
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z). Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
Group 13 hydrides are chemical compounds containing group 13-hydrogen bonds (elements of group 13: boron, aluminium, gallium, ... Alane(aluminum trihydride) is a ...
Aluminium or aluminum (13 Al) has 23 known isotopes from 21 Al to 43 Al and 4 known isomers.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.
It and aluminium are the only Group 13 elements to react with air at room temperature, slowly forming the amphoteric oxide Tl 2 O 3. [117] [118] It forms anionic thallates such as Tl 3 TlO 3, Na 3 Tl(OH) 6, NaTlO 2, and KTlO 2, [118] and is present as the Tl − thallide anion in the compound CsTl. [119]
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...