Answer: Air
Explanation:
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: table salt [tex]NaCl[/tex]
Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Gold [tex]Au[/tex] , nitrogen [tex]N_2[/tex]
Mixture is defined as a composition which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air
