![]() However, because a hydrogen peroxide molecule contains two oxygen atoms, as opposed to the water molecule, which has only one, the two substances exhibit very different properties. For example, water, H 2O, and hydrogen peroxide, H 2O 2, are alike in that their respective molecules are composed of hydrogen and oxygen atoms. ![]() The identity of a substance is defined not only by the types of atoms or ions it contains, but by the quantity of each type of atom or ion.
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