Transition elements may be defined as those elements which have partially filled d or f sub-shells in atomic state or in any of their commonly occurring oxidation states.
Properties of Transition Elements
Because of similar electronic configuration, the d-block elements closely resemble one another in their physical and chemical properties.
Some of the points of their resemblance are given below.
- They are all metals in true sense, some of which play important role in industry, e.g. Ti, Fe, Cr, Ni, Cu, Mo, W, Zr, Nb, Ta, Th, etc.
- They are all hard and strong metals with high melting and boiling points. They are also good conductors of heat and electricity.
- They form alloys with one another and also with other elements.
- With few exceptions, they show variable valency or oxidation state.
- Their ions and compounds are colored in solid state as well as in solution formed at least in one if not all the oxidation states.