The inner transition metals are shown in two rows at the bottom, in pink and purple. An inner transition metal is one of a group of chemical elements on the periodic table. They are normally shown in two rows below all of the other elements. They include elements 57-71 (lanthanides) and 89-103 (actinides). The lanthanides are very similar, and the actinides are all radioactive. They have three incomplete outermost electron shells and are all metals.