Question

Name the anion and cation which constitute the molecule of aluminium oxide

Answer 1

Anion in the molecule is oxide ion (
$o {}^{2 - }$
Cation is Aluminium ion
$al {}^{3 + }$

Answer 2

The cation is $Al^{3+}$ and anion is $O^{2-}$ which constitute the molecule of aluminium oxide.

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

For formation of aluminum oxide , aluminium will lose three valence electrons to form $Al^{3+}$ cation and oxygen will gain two electrons to form $O^{2-}$. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $Al_2O_3$.

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