Valency, Molecular Formula and Chemical Reaction

Things to remember

• The combining capacity of elements or the radicals with the other elements or radicals to form molecules of an element or compound is called valency.
• The arrangement of two electrons in the K-shell is said to be duplet.
• The molecular formula is defined as the symbolic representation of the molecule of a substance.
• The process by which a chemical change takes place is called as the chemical reaction.
• The chemical reaction which is expressed in terms of full names of reactant and product molecules is called word equation.
• The chemical equation which is written in terms of symbols by writing their molecular formula is called formula equation.