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The difference between Al and Al+3 is that the ion has lost 3 electrons, therefore it has 3 more protons than electrons, hence granting it a charge of +3.

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Why cant a 3 ion of aluminum be made by adding 3 protons to an aluminum atom?

Adding protons changes the element, creating a new element with a different atomic number. The element with 3 protons is not aluminum, so adding 3 protons would create a different element rather than a 3+ ion of aluminum.


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An aluminum ion generally has 13 protons (which is the atomic number of aluminum) and 10 electrons if it is a 3+ ion. The number of electrons in an ion depends on its charge - in this case, the aluminum ion has a +3 charge, meaning it has lost 3 electrons from its original neutral state.


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When aluminum combines with oxygen three oxygen atoms combine with this many aluminum atoms?

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