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typical elements are those which express properties of there group properly so atomic number 11 sodium to atomic number 17 chlorine are typical elements.top fo the group elements never express property of there group because they are of very small size so exception in most of the cases.diagonal relationship elements are like Li-Mg,Be-Al,B-Si these pair have almost similer properties because these have same ionic potential.bridge elements typical elements of third period are also called bridge elements as the division between two subgroups A and B starts from these elements for example Mg works as bridge element because it works as bridge between 2nda and 2nd b group so there properties are mix.
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