Chemical species

A chemical species refers to a specific form of a substance characterized by a particular number of atoms or molecules with a distinct structure and composition. It can be a simple element, like oxygen (O₂), or a compound, like water (H₂O). Different species of the same element, such as ozone (O₃), have different properties. Essentially, the term helps identify and differentiate the various forms that substances can take in chemical reactions and natural processes, based on their atomic makeup and arrangement.