👉 In chemistry, an atomistic is a concept that refers to the concept of atoms as the smallest indivisible unit of matter. In other words, atoms are the basic building blocks of matter and can be thought of as the smallest units in which all matter exists. Atomists believe that atoms are made up of individual particles that are held together by forces called attractive and repulsive nuclear forces. Atomistic concepts play a crucial role in understanding atomic structure and behavior, and they have been used to explain the