What is It It is important to note that elements are single substance. You can see them in the periodic table. In the list above, iron is an element because chloride is a compound because it is a combination of two elements single substance with one atom and is present in the periodic table. sodium and chlorine with 2 or more atoms. Therefore, an element ca broken anymore while compound can still be broken to its constituent. 01. Which among the substances are elements? 02. Which among the substances are compounds? ELEMENTS COMPOUNDE​