Large Office Equipment. Clerical workers must be knowledgeable in the proper operation of office machines such as printers, copiers and fax machines, as well as how to run disposal equipment such as paper and card shredders safely.
Protons, neutrons, and electrons can then organize to form atoms. Atoms are then used to create the molecules around us. As we just learned, there are almost 120 elements that can be found in the molecules we know. Smaller molecules can work together and build macromolecules.
The arrangement of electrons in an atom is called its electronic structure. The electronic structure of an atom refers not only to the number of electrons that an atom possesses but also to their distribution around the nucleus and to their energies. As we will see, electrons do not behave like anything we are familiar with in the macroscopic world. Our knowledge of electronic structure is the result of one of the major developments of twentieth-century science, the quantum theory.