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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 .
Atomicity is the total number of atoms present in a molecule ... while its atomic weight is 15.879; [4] therefore, its ... Aluminium (Al) 1 14 Silicon (Si) 1 15 ...
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z). ... Aluminium: Al: 26.9815386(8) 1.61: 5.98577: 125 ...
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 ...
The list below gives the elements arranged by increasing atomic number and shows the number of electrons per shell. ... Aluminium: 2, 8, 3: 13 14: Silicon: 2, 8, 4: ...
Atomic number is the number of protons, and therefore also the total positive charge, in the atomic nucleus. ... produced by the elements from aluminium (Z = 13) to ...
The standard atomic weight is 26.981 5385 (7). 26 Al is produced from argon in the atmosphere by spallation caused by cosmic-ray protons. Aluminium isotopes have found practical application in dating marine sediments, manganese nodules, glacial ice, quartz in rock exposures, and meteorites.
This results in a variety of oxidation states. In the lighter elements, the +3 state is the most stable, but the +1 state becomes more prevalent with increasing atomic number, and is the most stable for thallium. [19] Boron is capable of forming compounds with lower oxidization states, of +1 or +2, and aluminium can do the same. [20]