Question
What is the basic theme of organisation in the periodic table?
Solution
Before the 18th century, only a 31 elements are known & it was quite east to study their chemical & physical properties. But with the passage of time, more & more elements were discovered. By 1865, the number of identified element had more than doubled to 63. At present 114 elements are known. It was not possible to study & remember each of them individually . Because many of them have different properties.So, there arise the need of developing a table in which all the elements can be classified according to similar properties so that less confusion can be generated & true information can be generated by the different elements present in the periodic table.
