The oxidation number of aluminium in Al3+ is?

Study for the CIE Chemistry Advanced Subsidiary (AS) Level Test. Prepare with multiple-choice questions and detailed explanations. Master the exam!

Multiple Choice

The oxidation number of aluminium in Al3+ is?

Explanation:
Oxidation numbers reflect the charge that an atom would have in a compound or ion. In a monatomic ion, the oxidation number of the element equals the ion’s overall charge. The aluminium ion Al3+ has a +3 charge, and since aluminium is the only atom in the ion, its oxidation number must be +3. This aligns with the required +3 charge. The other options would imply charges that don’t match the ion’s overall +3.

Oxidation numbers reflect the charge that an atom would have in a compound or ion. In a monatomic ion, the oxidation number of the element equals the ion’s overall charge. The aluminium ion Al3+ has a +3 charge, and since aluminium is the only atom in the ion, its oxidation number must be +3. This aligns with the required +3 charge. The other options would imply charges that don’t match the ion’s overall +3.

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