A chemical compound formed when an element combines with oxygen to form its second highest valence state or oxidation number.
From Greek 'deuteros' (second) + oxide (oxygen compound), using systematic chemical nomenclature to describe compounds by the number of oxygen atoms or oxidation state.
Some elements are show-offs and bond with oxygen in multiple ways—deutoxide is chemistry's way of saying 'this is version 2.0,' like how iron oxide comes in multiple rust flavors!
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