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 This will be followed by
consideration of certain general aspects such as electronic
configurations, oxidation states and chemical reactivity
of the inner transition metals THE TRANSITION ELEMENTS (d-BLOCK)
The d–block occupies the large middle section of the periodic table
flanked between s– and p– blocks in the periodic table The d–orbitals
of the penultimate energy level of atoms receive electrons giving rise to
four rows of the transition metals, i