why is aluminium trivalent
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Ordinarily, aluminum is trivalent. ... In aluminum the configuration of the three outer electrons is such that in a few compounds (e.g., crystalline aluminum fluoride [AlF3] and aluminum chloride [AlCl3]) the bare ion, Al3+, formed by loss of these electrons, is known to occur.
Valence: 3
Atomic weight: 26.9815384
Atomic number: 13
Electron configuration: 1s22s22p63s23p1
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