Because transition elements have vacant d orbital and and can act as catalyst and inner transition elements have vacant f orbital. they are also have properties to act as catalyst and and nobels gases have fully filled electronic configuration and that is why they are stable, but 1,2,13,14,15,16,17 elements do have any of the property like d, f and Nobel elements so they are called normal or representative elements.

Representative or normal elements
The elements 1, 2, 13, 14, 15, 16, and 17 in the periodic table are collectively referred to as representative or normal elements. This classification is based on their electron configurations and the properties they exhibit.

Understanding the Representative Elements
The periodic table is divided into several blocks, including the s-block, p-block, d-block, and f-block. The representative elements are mainly found in the s and p blocks of the periodic table.

S-Block Elements
The s-block elements include hydrogen (H) and helium (He) from group 1 and group 2 of the periodic table, respectively. These elements have their outermost electrons in the s orbital, which can accommodate a maximum of 2 electrons. Group 1 elements, known as alkali metals, have 1 valence electron, while group 2 elements, known as alkaline earth metals, have 2 valence electrons.

P-Block Elements
The p-block elements consist of groups 13 to 18 in the periodic table. These elements have their outermost electrons in the p orbital, which can accommodate a maximum of 6 electrons. Group 13 elements have 3 valence electrons, group 14 elements have 4 valence electrons, group 15 elements have 5 valence electrons, group 16 elements have 6 valence electrons, group 17 elements have 7 valence electrons, and group 18 elements have 8 valence electrons (except helium).

Properties of Representative Elements
The representative elements exhibit a wide range of properties due to their varying electron configurations. Some key properties include:

- Alkali metals (group 1) are highly reactive metals that readily lose their valence electrons to form positive ions.
- Alkaline earth metals (group 2) are also reactive metals, but less reactive than alkali metals.
- Group 13 elements are generally metals that exhibit both metallic and non-metallic properties.
- Group 14 elements are known as the carbon group and can exhibit properties of both metals and non-metals.
- Group 15 elements are known as the nitrogen group and consist of non-metals, metalloids, and metals.
- Group 16 elements are known as the chalcogens and consist of non-metals, metalloids, and a metal.
- Group 17 elements are known as the halogens and consist of highly reactive non-metals.
- Group 18 elements are known as the noble gases and are chemically inert due to their stable electron configurations.

Conclusion
The elements 1, 2, 13, 14, 15, 16, and 17 in the periodic table collectively belong to the representative or normal elements. These elements exhibit a wide range of properties and are found in the s and p blocks of the periodic table. Understanding the classification and properties of these elements is essential in chemistry and the study of the periodic table.