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Simple really, this is due to the fact that Aluminum is in group 3 of the Periodic Table meaning it has 3 electrons in its outer shell. Atoms strive to have a full outer shell, so the quickest way for that is to lose the 3 and get rid of that shell, where the shell below is full. As electrons have a negative charge, because the atom has lost 3 electrons, the overall charge becomes positive. 3+.

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