Final answer:
A substance consisting of atoms of two or more different elements joined by chemical bonds is known as a compound. It has elements in a fixed ratio, distinct from mixtures, with water and glucose being common examples.
Step-by-step explanation:
The term that describes a substance made up of atoms of two or more different elements joined by chemical bonds is a compound. A compound is characterized by having a fixed ratio of its constituent elements and is held together by various types of chemical bonds, such as ionic or covalent bonds.
A familiar example of a compound is water (H₂O), which is composed of hydrogen and oxygen atoms in a 2:1 ratio. Another example is glucose, with the molecular formula C₆H₁₂O₆, which always contains six carbon, twelve hydrogen, and six oxygen atoms. Compounds are distinct from mixtures in that the latter is composed of two or more substances that are not chemically bonded and can vary in the ratio of their components.