Though their formal honorific is Representative, members of the U.S House of Representatives are frequently called congressmen or congresswomen, while U.S. Senate members are mainly called senators. Article I, Section 6, of the U.S. Constitution requires members of Congress to decide its pay.
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.
Quick Answer. Physicist Ernst Ruska and German engineer Max Knoll are credited with creating the first electron microscope in 1932. It permitted researchers greater magnification and resolution than traditional light microscopes.