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AO2, like CO2 (carbon dioxide)
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The valency of an element is 4. that means it is 4th A group element. all 4A group elements carbon(C), silicon (Si), lead (Pb), germanium(Ge), tin (Sn). their oxides are CO₂, SiO₂, PbO₂, SnO₂, GeO₂. so the formula of A oxide is AO₂.
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