Answer:
A substance made of two or more types of atoms that are not chemically bonded
Step-by-step explanation:
An element comprises of a single entity of the same characteristics being present. An example is Hydrogen which has only hydrogen atoms present.
A compound comprises of two or more elements or substances which are chemically bounded together. An example is Hcl which has Hydrogen and Chlorine atoms present.
A mixture comprises of two or more substance of matter which are not chemically bonded together. An example is a mixture of Sand and salt.