Aluminium forms which ion?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Aluminium forms which ion?

Explanation:
Aluminium has three electrons in its outer shell (3s2 3p1). To reach a stable, noble-gas electron arrangement, it tends to lose all three valence electrons, forming Al3+. This +3 state is the common oxidation state in compounds and in solution. Losing only one or two electrons would leave a less stable electron configuration, so ions with smaller positive charges are not typical for aluminium. The neutral atom is not an ion, so Al0 isn’t the ion formed.

Aluminium has three electrons in its outer shell (3s2 3p1). To reach a stable, noble-gas electron arrangement, it tends to lose all three valence electrons, forming Al3+. This +3 state is the common oxidation state in compounds and in solution. Losing only one or two electrons would leave a less stable electron configuration, so ions with smaller positive charges are not typical for aluminium. The neutral atom is not an ion, so Al0 isn’t the ion formed.

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