Question

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What is the valency of Al, Al^+
, Al^2+ and Al^3+ ?​

Answer 1

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For example, aluminum sulfate has the formula Al2(SO4)3. Aluminum has a valence of 3+. Because there are two aluminum atoms in the formula, the total valence is 6+. Because there are three sulfate ions in the formula, 6 divided by 3 yields a valence number of 2 for sulfate.