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In chemistry , subgroups are those groups in the periodic table of chemical elements that belong to the d and f block . The periodic table contains eight main and ten subgroups. All subgroup elements are metals ( transition metals ).

Subgroups of the periodic table are:

In practice, the lanthanoids and actinides are also counted among the subgroup elements and referred to as “inner transition metals” - in contrast to the d-block elements, which are called “outer transition metals”.

The chemical properties of the elements mainly depend on the external electrons . Since the subgroup elements have one or two outer electrons and the differences lie in the next inner shell , elements of different subgroups are chemically more similar than elements of different main groups.

Individual evidence

  1. a b Entry on transition metals. In: Römpp Online . Georg Thieme Verlag, accessed on August 23, 2017.