An element contains only one type of atom.

A compound contains two or more elements chemically combined.

Water (H2O) is a compound made of hydrogen and oxygen.

Elements can’t be broken down by chemical means.

Compounds have different properties from their elements.

Salt (NaCl) is a compound of sodium and chlorine.

Mixtures can be separated physically, compounds cannot.

Elements are pure substances; mixtures contain multiple substances.

Compounds are formed by chemical bonds.

The properties of a compound depend on its elements and structure.