I would say very many elements exista as monoatomic molecules.All the metals,for example.Don\'t get confused by the fact that if metals have a crystaline structure,then the molecules would be composed by more than one atoms... An Element Is A Single Atom. No, an element is any material that is composed of only a single kind of atom (ie: all its atoms are identical) While A Molecule Is A Group Of Atoms That Are Bond Together To Form Another Compounds... A molecule is a group of atoms that are bonded together, but they do not form a compound. A compound is is something whose molecules contain more than one kind of atom. Some Elements Exist As A Diatomic Atom. Some elements are a collection of diatomic molecules. You can not have a diatomic atom - that\'s self-contradictory. Example Of These Are Hydrogen And The Halogens Family( Chlorine. Fluorine Etc.) In Case Of Hydrogen. Hydrogen Is A Diatomic Atom. If The Hydrogen Bonded To Other Elements This Is An Example Of Molecule... Hydrogen is made up of diatomic molecules. If hydrogen bonds with atoms of another element you get a compound. In Short Element Is A Single Atom While Molecule Composed Of 2 Or More Atoms That Are Bonded Together. You can not compare an element and a molecule. You can compare an element and a compound. An element is made of only a single kind of atom - whether as a crystal (Fe), or isolated atoms (He) or as molecules (H2), does not matter. A compound is made up of molecules (or crystals) with more than one kind of atom (NH3, H2O, NaCl) Solution I would say very many elements exista as monoatomic molecules.All the metals,for example.Don\'t get confused by the fact that if metals have a crystaline structure,then the molecules would be composed by more than one atoms... An Element Is A Single Atom. No, an element is any material that is composed of only a single kind of atom (ie: all its atoms are identical) While A Molecule Is A Group Of Atoms That Are Bond Together To Form Another Compounds... A molecule is a group of atoms that are bonded together, but they do not form a compound. A compound is is something whose molecules contain more than one kind of atom. Some Elements Exist As A Diatomic Atom. Some elements are a collection of diatomic molecules. You can not have a diatomic atom - that\'s self-contradictory. Example Of These Are Hydrogen And The Halogens Family( Chlorine. Fluorine Etc.) In Case Of Hydrogen. Hydrogen Is A Diatomic Atom. If The Hydrogen Bonded To Other Elements This Is An Example Of Molecule... Hydrogen is made up of diatomic molecules. If hydrogen bonds with atoms of another element you get a compound. In Short Element Is A Single Atom While Molecule Composed Of 2 Or More Atoms That Are Bonded Together. You can not compare an element and a molecule. You can compare an element and a compound. An element is made of only a single kind of atom - whether as a crystal (Fe), or isolated atoms (He) or as molecules (H2), does not matter. A compound is made up of .