Oxygen typically has a valency of two, meaning it can form two bonds with other atoms. This valency determines how oxygen combines with other elements to form compounds, such as water (H2O) where each oxygen atom bonds with two hydrogen atoms.
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The valency of oxygen is typically -2, meaning it tends to gain two electrons to achieve a stable octet configuration. This valency influences compound formation by oxygen readily forming compounds with elements that can donate electrons, such as metals, resulting in stable ionic compounds like oxides.