Question

given the valency for aluminium +3and oxygen as -2 write the chemical formula for aluminium oxide​

Answer 1

Answer:

Explanation:

In terms of electron arrangement in the formation of the ionic compound aluminium oxide, two aluminum atoms donate their three outer electrons to three oxygen atoms. This results in two triple positive aluminium ions to three double negative oxide ions via electron transfer.

How is this formula generated? First of all, we have to consider that aluminium is a metal and Oxygen is a non-metal making it an ionic compound. There is some charge in the aluminum and oxygen ions. Aluminum has a +3 charge whereas oxygen has -2 charge. On applying the criss-cross method we get the formula of aluminum oxide. Usually, aluminium loses three electrons while oxygen gains two electrons in the chemical process and this is mainly done to achieve stability.