The basic theme of organisation of elements in the periodic table is to classify the elements in periods and groups according to their properties. This arrangement makes the study of elements and their compounds simple and systematic. In the periodic table, elements with similar properties are placed in the same group.

To make the study of elements easy , if we start studying the elements one by one it takes our whole life , it is difficult to study the individual elements and millions of their compounds this led to the organization of the periodic table

The Basic Theme of Organization in the Periodic Table

The periodic table is a tabular arrangement of chemical elements based on their atomic number, electron configuration, and recurring chemical properties. The basic theme of organization in the periodic table is to group elements with similar properties together and to organize them in a way that allows for easy identification and understanding of their characteristics.

1. Classification into Periods and Groups:
The periodic table is divided into periods (rows) and groups (columns). Periods represent the number of electron shells an atom possesses, while groups indicate the number of valence electrons in an atom's outermost energy level. This classification provides a basis for understanding the periodicity of properties and trends across the table.

2. Periodicity of Atomic Properties:
Elements within the same period generally exhibit a gradual change in properties as atomic number increases. This periodicity arises due to the filling of electron shells and the corresponding changes in electron configuration. For example, elements in the same period show a progressive increase in atomic radius and electronegativity from left to right.

3. Similarity in Chemical Properties:
Elements within the same group share similar chemical properties because they have the same number of valence electrons. Valence electrons are responsible for an element's reactivity and bonding behavior. Consequently, elements in the same group tend to form similar types of compounds and exhibit comparable chemical behavior.

4. Block Classification based on Electron Configuration:
Elements in the periodic table are further classified into blocks based on their electron configuration. The blocks include s-block, p-block, d-block, and f-block elements. This classification aids in understanding the relationship between electronic structure and elemental properties.

5. Transition Metals:
The transition metals are located in the d-block of the periodic table and exhibit similar chemical properties. They are known for their variable oxidation states and the ability to form complex compounds. This organization allows for easy identification of these elements and their unique characteristics.

6. Lanthanides and Actinides:
The f-block elements, known as the lanthanides and actinides, are placed at the bottom of the periodic table. These elements possess unique electronic configurations and exhibit similar chemical behavior within their respective series. Their placement at the bottom of the table helps maintain the overall structure and organization.

Overall, the basic theme of organization in the periodic table is to arrange elements in a way that reflects their fundamental properties, electron configurations, and chemical behavior. This arrangement allows scientists to easily identify and study the characteristics of different elements, predict their properties, and understand the trends and patterns that emerge across the table.