What is the basis theme of organisation in the periodic table?
The periodic table is organized to simplify and systematize the study of numerous properties of all the elements and their compounds. Similar elements are placed together and dissimilar elements are separated from one another.
The study is simple to remember as the properties of elements are studied in the form of groups or families having similar properties rather than studying these elements individually.
The long form of the periodic table is based on the fact that the physical and chemical properties of the elements are the periodic functions of their atomic numbers (Modern periodic law). The elements are arranged in the increasing order of their atomic numbers.