Transition metal dichalcogenides (TMDs) are a class of two-dimensional (2D) materials with unique electronic and optical properties. Composed of transition metal atoms (such as tungsten, molybdenum, ...

Iron, a transition metal, has a higher melting point and a higher density than the non-transition metals.

Transition metals close transition metalA metal that is located in between group 2 and group 3 (labelled as group 13 on some modern periodic tables) and has brightly coloured compounds.