Chemist's study is a field of science that focuses on the composition, structure, and properties of matter. It involves the study of atoms and isotopes, which are the smallest particles of an element that have the same chemical properties. Isotopes are atoms with different numbers of neutrons, and they can be used to identify elements and measure their concentrations in a sample. The study of atoms and isotopes is essential for understanding the behavior of matter and its interactions with other substances.