Basic Concepts of Inorganic Chemistry, 2nd Edition

5

Transition Metals, Lanthanides and Actinides

Elements having partially filled inner d-orbitals [(n − 1)d orbitals] in their atoms or ions are known as transition elements. These elements are d-block elements and are present between s-block and p-block elements in the periodic table. For example, Fe (26)

 

Fe (26)	[Ar]183d64s2	Thus Fe, Fe2+ and Fe3+ are transition elements.
Fe2+	[Ar]l83d6
Fe3+	[Ar]183d5
Ti (22)	[Ar]183d24s2
Ti2+	[Ar]183d2	Transition elements
Ti+3	[Ar]183d1
Ti+4	[Ar]18	Not like transition elements as inner d orbitals have no electron (3d°)

 

General electron configuration (n − 1)d^Xns² or (n − 1)d^Xns¹, x = 1 to 10

There are four transition series elements in the periodic table. They are

 

Table 5.1 ...