A Chemical symbol represents a specific element or an atom of an element. A chemical symbol makes it easier to write a chemical reaction. A Valence describes how easily an atom or radical can combine with other chemical species. The Language of Chemistry or Chemical Equations, published in 2010, is a book that covers different types of chemical equations. A chemical symbol depicts a particular element or an atom of an element. A group of atoms which behaves like a single unit and shows valency is known as radical. The process of transformation of one set of chemical substances to another is called a chemical reaction. A chemical equation expresses a chemical reaction by representing the reactants, products and their physical states symbolically.