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Question:

Why is Aluminiumoxid composed of 2 Al-atoms and 3 O-atoms?

I now that the valency of aluminium is 3 and the valency of oxygen is 2The two aluminium atoms are bond together, so there are only 2 valences per Al-atoms left for the 2 O-atomsSo in my understanding the Aluminiumoxid should be AL2O2.Thanks for the help in advance!Greetings

Answer:

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Hi, I think you have a misunderstanding there Aluminium oxide is not a covalent compoundRather, it is an ionic compound This is because Aluminium gives up the three electrons from its outer valence electron shell to form a stable octet configurationSame goes for oxygen, except that it gains two electrons to form the stable octet structure (as losing 6 electrons requires too much energy) Hence, Al becomes Al3+ while O becomes O2-Ionically bonded, it means these ions are held together by electrostatic forces of attraction in a crystal latticeThe overall charge of the compound should be neutralIn order to neutralise the charge, two Al and three O are needed to create an overall charge of ZERO.

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