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The ion Al3+ is a cation. Means that it has 3 positive charges i.e. 3 electrons are donated by aluminium.
The ion O2- is an anion. Means that it has 2 negative charges i.e. 2 electrons are accepted by oxygen.
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Here,
The ion Al3+ is a cation. Means that it has 3 positive charges i.e. 3 electrons are donated by aluminium.
The ion O2- is an anion. Means that it has 2 negative charges i.e. 2 electrons are accepted by oxygen.