Dot-and-cross diagram of aluminum oxide (Al₂O₃)

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Dot-and-cross diagram of aluminum oxide: 2 in front of a bracketed Al³⁺ ion with 8 crosses, and 3 in front of a bracketed O²⁻ ion with 6 dots and 2 crosses — A dot-and-cross diagram of aluminum oxide, Al₂O₃, drawn as one of each ion with its number in front: 2[Al]³⁺ and 3[O]²⁻. Each aluminum ion has 8 crosses on its outer shell, and each oxide ion its own 6 electrons as dots and the 2 it gained as crosses.

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Answer key

Each Al loses 3 electrons and each O gains 2.
Al³⁺ 2,8; O²⁻ 2,8

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