Hence, transition elements
and their compounds are studied separately However,
the usual theory of valence as applicable to the non-
transition elements can be applied successfully to the
transition elements also Various precious metals such as silver, gold and
platinum and industrially important metals like iron,
copper and titanium belong to the transition metals series In this Unit, we shall first deal with the electronic
configuration, occurrence and general characteristics of
transition elements with special emphasis on the trends
in the properties of the first row (3d) transition metals
along with the preparation and properties of some
important compounds