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Al2O3 (2 Al’s gives total of 6 e–‘s to 3 O’s to form 2Al3+ and 3O2–)
The geometry is octahedral.
The bonds are ionic (2 Al3+ cations to 3O2- anions).
Aluminum oxide exists in several different crystallographic forms, of which corundum is most common. Corundum is characterized by a high specific gravity (4.0), a high melting point (about 2,050° C, or 3,700° F), great insolubility, and hardness.
Element: Al ; % Composition: 52.93; Formal Oxidation State: +3 Formal Electronic Structure: [Ne]
Element: O; % Composition: 47.07; Formal Oxidation State: -2 Formal Electronic Structure: [He].2s2.2p6
A Group 3 metal + a Group 6 non-metal e.g. aluminium + oxygen ==> aluminium oxide Al2O3 or ionic formula (Al3+)2(O2-)3 In terms of electron arrangement, two aluminium atoms donate their three outer electrons to three oxygen atoms. This results in two triple positive aluminium ions to three double negative oxide ions. All the ions have the stable electronic structure of neon 2.8. Valencies, Al 3 and O 2.
2Al (2.8.3) + 3O (2.6) ==> 2Al3+(2.
can be summarized electronically as 2[2,8,3] + 3[2,6] ==> [2,8]3+2 [2,8]2-3