ABSTRACT
Electrons can be portrayed as negatively charged entities moving around the atomic nucleus in orbits, or shells (see 4.3). Important additional points here are, first, that the atoms of each element have a characteristic number of shells, and second, that within each of these shells there is a characteristic number of electrons. Knowing these fundamentals is vital, but in order to understand better some important chemical phenomena we need to look more closely at electrons and their shells.
