Elements: Sodium, Silver, Tin, silicon.
Compounds: Calcium carbonate, Carbon dioxide, Methane.
Mixture: Soil, Sugar solution, coal, air, blood, soap.
An element is a pure substance consisting only of atoms that have the same numbers of protons in their atomic nuclei. Elements cannot be broken down into simpler substances by any chemical means.
A compound is a substance formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary which are covalent bonds and ionic bonds. The elements are always present in fixed ratios in any compound.
A mixture is made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.