Define Periodicity in Chemistry

Define Periodicity in ChemistryTo be able to understand the concept of periodicity in chemistry, you must first understand what a periodic variation is. In a word, a periodic variation is a series of changes over a period of time, which can be very small or extremely large. The common denominator of any periodic variation is the difference in phase that it produces.There are two types of periodic variations in chemistry: those produced by different chemical mixtures and those caused by symmetry. As an example, remember that a water molecule has a molecular weight of one hundred and one? If you mix equal quantities of one hundred parts of hydrogen and one part of oxygen then you will have a liquid with both hydrogen and oxygen molecules. Of course, this does not really make any sense because each molecule contains only one type of molecule.A more logical representation of the one-thousand-part mixture is a picture of a stick with an equal mass of water at one end and hydrogen at the o ther end, where the stick has two streams of the same type of molecule running through the middle. In reality, however, it is exactly the same stick; a hydrogen molecule has one electron and a water molecule has one more electron than the hydrogen molecule.In order to be able to explain the idea of a certain hydrogen molecule having one electron and one water molecule having two electrons, you need to be able to associate the mass of each molecule to the mass of the other molecule. To do this, you can create a first-order differential equation, as this allows you to replace each water molecule's mass with that of the hydrogen molecule's mass.Using this equation, we can see that if one of the hydrogen molecules is allowed to be smaller than the other then they will move together towards the center of the stick, with the effect that the stick will be allowed to expand slightly. This expansion will cause the molecules to be closer together; thus creating a very small set of molecules w ith equal numbers of atoms. In order to see how the increase in the size of the molecule affects the size of the molecules, we can use a second-order differential equation, which makes the assumption that the smaller molecule is less massive than the larger molecule. In this case, the two molecules will move closer together and the larger molecule will become much smaller.Periodicity in chemistry can be used to explain how a number of small molecules can fit into a larger one. This is often referred to as a monomer.Periodic variation in chemistry is therefore a combination of the kinetic theory of gases and the symmetry principle. By looking at these two principles we can develop theories of light absorption, wave reflection, and other properties.