integration. 1  an act or instance of combining into an integral whole. 2  an act or instance of integrating a racial, religious, or ethnic group. 3  an act or instance of integrating an organization, place of business, school, etc. 4  Mathematics. the operation of finding the integral of a function or equation, especially solving a differential equation.
In the early years of the twentieth century, atoms were still theoretical entities. Strong circumstantial evidence suggested that atoms existed, but no one had ever actually seen an atom. Today, we can not only see individual atoms on surfaces-we can also move them from place to place, and build things from them.s the tip is dragged over an atom on the surface, more electrons tunnel and the needle is rigged so that the increase in current causes the tip to move up. As the tip is dragged off the atom, the distance between the tip and the surface widens, causing a decrease in current which moves the tip down.
Nearly one hundred percent of the mass of an atom (99.94%) is contained in the nucleus. The mass of the protons and the mass of the neutrons are almost the same. Electromagnetic force binds the electron cloud to the nucleus. A nearly identical force can allow atoms to bind together, forming molecules. Atoms exist as either electrically neutral, or ions.