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Explain the classification of elements based on chemical behavior and on physical properties. |
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Answer» <P> Solution :BASED on chemicalBased on physical behavior properties 1.Main group elements, 1.metals 2.Noble gases , 2. Non - metals 3. Transition elements, 3. Metalloids 4.Inner - transitionelements Based of chemical behavior : (i)Main group demands : All s- block and p- block elements excluding 18th groupelements 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)` . theseelements 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 betweens- block and p- block elements. (iv)inner transition elements : The elements off- 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 . |
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