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Two or more atoms held strongly together by covalent bonds.
Two or more atoms held strongly together by covalent bonds. Molecules can contain atoms of a single element, such as oxygen molecules which consist of a pair of oxygen atoms. Or they can contain atoms of different elements: from water molecules, H2O, to huge, complex organic compounds, such as DNA.
Molecules can contain atoms of a single element, such as oxygen molecules which consist of a pair of oxygen atoms. Or they can contain atoms of different elements: from water molecules, H2O, to huge, complex organic compounds, such as DNA.