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All the atoms are the same in a molecule of an element but not in compound . ex- in a molecule of water  there is one oxygen atom and two hydrogen atoms but both of the atoms are oxygen in a molecule of oxygen ,
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molecules of element :- 
molecules of these elements are constituted by the same type of atoms . molecules of Ar , Fe etc....
molecules of compound :- 
atoms of different atoms combine together in definite proportions to form molecules of compounds .examples are water , ammonia etc....
       i hope it helps.....................^_^ 

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