What is the chemical formula for the binary compound composed of Al3+ and O₂- ions?

Name: What is the chemical formula for the binary compound composed of Al3+ and O₂- ions?
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Question

Quizplus · Accepted Answer

The charge on aluminum ion is +3 and the charge on oxide ion is -2. The compound must have a neutral charge, so the formula must balance the charges. The lowest common multiple of 3 and 2 is 6, so we need two aluminum ions to balance the charge of three oxide ions. The formula is Al₂O₃.

What Is the Chemical Formula for the Binary Compound Composed