Why were subgroups taken in Mendeleev's periodic table
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because in the same group elements some properties are dissimilar to avoid this the groups are divided into sub grouos
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hola!
In the modern periodic table the subgroups A and B are clearly separate because the elements belonging to subgroup A differ in properties from those of elements belonging to subgroup B. In Mendeleev's periodic table the two subgroups are kept together.
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