Question

what are the difference between the molecules of element and compound?

Answer 1

in an element all molecules are the same in composition
in a compound the molecules vary from larger amounts of different substances. cheers mate

Answer 2

The only difference between amolecule of a compound and amolecule of an element is that in a molecule of an element, all the atoms are the same. For example, in a molecule of water (a compound), there is one oxygen atom and two hydrogen atoms. But in a molecule of oxygen (anelement), both of the atoms are oxygen.