Atoms Essay -- essays research papers

The beginning student of chemistry moldiness have a knowledge of the theory which forms the solid ground for our understanding of chemistry and he must acquire this knowledge before he has the mathematical background required for a rigorous course of study in quantum mechanics. The present draw close is designed to meet this need by stressing the somatic or patent aspects of the theory through an extensive use of the electronic charge density. The way of life in which the negative charge of an atom or a pinpoint is arranged in three-dimensional space is determined by the electronic charge density distribution. Thus, it determines directly the sizes and shapes of shreds, their electrical moments and, indeed, all of their chemical and physical properties. Since the charge density describes the distribution of negative charge in substantive space, it is a physically measurable quantity. Consequently, when used as a basis for the discussion of chemistry, the charge density allo ws for a direct physical contrive and interpretation. In particular, the forces exerted on a nucleus in a molecule by the other nuclei and by the electronic charge density may be rigorously calculated and interpreted in terms of innocent electrostatics. Thus, given the molecular charge distribution, the stability of a chemical perplex may be discussed in terms of the electrostatic requirement of achieving a zero force on the nuclei in the molecule. A chemical tie up is the result of the accumulation of negative charge dens...