In Mendeleev's periodic table, the groups were divided into how many subgroups?

The periodic table is composed of seven horizontal rows or periods and is numbered between 1 and 7.  Elements are arranged in the periodic table in the increasing order of their relative atomic masses. In Mendeleev’s periodic table, the groups were divided into two subgroups.

  • Groups from I to VII are meant for normal elements and group VIII is for transition elements.
  • Groups from I to VII have been divided into two subgroups, while group VIII is meant for three elements.

 

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