Transition Elements: These are also known as d-block elements (group 3 – 12) because the last electron in these elements enter in d-orbital of the Penultimate (inner to the outermost) shell and are defined as, “those elements which have partially filled (n-1)d sub-shell either in the elementary state or in any of their common oxidation states”. However, this definition does not include transition metals like Zn, Cd and Hg because they do not contain a partially filled d sub-shell either in the elementary state or in their oxidation states, but due to some similar properties, they are included in Transition … Continue reading Transition Elements and its Classification