What term describes a chemical combination of two or more different elements in a fixed ratio?

A chemical combination of two or more different elements in a fixed ratio is referred to as a chemical compound. This term captures the essence of the formation of substances through the chemical bonding of different elements, resulting in a unique substance with distinct properties different from the individual elements that constitute it.

For example, water (H₂O) represents a chemical compound composed of two hydrogen atoms and one oxygen atom, thus demonstrating the fixed ratio concept.

The nature of compounds can vary, leading to classifications such as organic and inorganic. Organic compounds generally contain carbon and are associated with living organisms, while inorganic compounds do not predominantly feature carbon. However, both are indeed types of chemical compounds.

Understanding this concept is crucial because it lays the foundation for exploring how elements interact and combine to form the diverse range of materials found in nature.