when was the electron cloud model
This principle forms the basis of the electron cloud model. Thus we see that an electron cloud model is a visual model that gives the probable locations of electrons in an atom. In this model, electrons are not shown as particles moving around the nucleus in a fixed orbit. It is a modern and the most accepted atomic model, and has rendered all previous explanations of the atomic structure obsolete. Erwin Schrodinger, an Austrian physicist came up with the electron cloud model in 1926.