<P> A molecule may be homonuclear , that is , it consists of atoms of one chemical element , as with oxygen ( O ) ; or it may be heteronuclear , a chemical compound composed of more than one element , as with water ( H O ) . Atoms and complexes connected by non-covalent interactions , such as hydrogen bonds or ionic bonds , are generally not considered single molecules . </P>
<P> A molecule may be homonuclear , that is , it consists of atoms of one chemical element , as with oxygen ( O ) ; or it may be heteronuclear , a chemical compound composed of more than one element , as with water ( H O ) . Atoms and complexes connected by non-covalent interactions , such as hydrogen bonds or ionic bonds , are generally not considered single molecules . </P>
a molecule that is composed of only one element is a
a molecule that is composed of only one element is a
homonuclear
homonuclear