What is Inner transition metal?
[[File:Periodic Table Armtuk3.svg|thumb|400px|Periodic Table. The inner transition metals are shown in two rows at the bottom, in pink and purple]] '''Inner transition metal'''s (ITM) are [[chemical element]]s on the [[periodic table]]. They are normally shown in two rows below all the other elements. They include elements 57-71, or [[lanthanide]]s, and 89-103, or [[actinide]]s. The lanthanides are very similar, and the actinides are all [[radioactive]]. ITMs have three incomplete outermost [[electron shell|nucleus shell]]s and are all metals. In some cases they are quite [[malleable]] and [[ductile]]. Many lanthanides such as [[Lutetium]] are used in the lighting industry. Actinides do not occur in nature (except for [[thorium]] and [[uranium]]), and are highly unstable. The last electrons enter into the f orbitals of these elements, so they belong to the [[F-block]]. The general electron configuration is (n-2)f^0-14(n-1)d^0-2np^6ns^2 where n= 6-7. <gallery> File:HEUraniumC.jpg|Uranium metal, an actinide File:Lanthanum.jpg|Lanthanum metal, a lanthanide </gallery> {{-}} {{chem-stub}} [[Category:Chemical elements|+]]