Explain the classification of elements based on chemical behavior and on physical properties.

Explanation

Based on chemical
Based on physical
behavior
properties
1. Main group elements , 1. metals
2. Noble gases , 2. Non - metals
3. Transition elements , 3. Metalloids
4. Inner - transition elements
Based of chemical behavior :
(i) Main group demands : All s- block and p- block elements excluding 18th group elements are called representative elements.
(ii) Noble gases : The `18^(th)` group elements are exclusively called noble gases . They have completely filled electronic configurations as `ns^(2)np^(6)` . these elements are highly stable.
(iii) Transition elements : The elements of d- block are called transition elements these include elements of groups from 3rd to 12th lying between s- block and p- block elements.
(iv) inner transition elements : The elements of f- block are called inner - transition elements. these consists of lanlanides and actinides , with 14 elements in each.
Based of physical properties :
(i) Metals : Metals comprise more ran `78%` of all know elements they are usally solids at room temperature . They have high melting and boiling points.
(ii) Non - metals : Non - metals are usually solids or liquids or gases at room temperature with low melting and low boiling points . They are poor conductors of heat and electricity.
(iii) Metalloids or semi metals : Some elements in the periodic tables show properties that are characteristics of both metal and non - metals. They are called metalloids .