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The common element in MgO (magnesium oxide), Al2O3 (aluminum oxide), and CaO (calcium oxide) is oxygen. All three compounds consist of a metal cation (magnesium, aluminum, or calcium) combined with oxygen anions. This results in the formation of metal oxides, which are typically ionic compounds. Additionally, they all exhibit properties common to metal oxides, such as high melting points and basic character.

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2mo ago

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