Chemistry

6614 d and f - block elements transition elementsIt is clear that the elements of II-B i.e. Zn, Cd and Hg do not have partially filled d-subshellin the elemental state or ionic state.They do not show the typical properties of the transition elements to an appreciable extent.The elements of the group III-B are Sc21, Y31 and La57. They do not show many of theirproperties typical of transition elements. In the compound state, they show tri-positive ion i.e.Sc +3 , Y +3 and La +3 . In this way they do not have any electron in d-orbital.For the reason, that the elements of group II-B and III-B are non-typical transition elements.Non-Typical Transition ElementsII-B and III-BTypical Transition ElementsIV-B, V-B, VI-B, VII-B, VIII-B and I-B14.2 GENERAL FEATURES14.2.1 General Features of Transition Elements1. They are all metallic in nature.2. Some of the transition elements play an important role in the industry. These metals areTi, Cr, Fe, Ni, Cu, Mo, W, Zr, Nb, Ta and Th etc.3. They are all hard and strong metal with high melting and boiling points. They are goodconductors of heat and electricity.4. They form alloys with one another and other elements of periodic table as well.5. With a few exceptions, they show variable oxidation states.6. Their ions and compounds are colored in the solid state and the solution state.Quick Quiz1. Give the electronic configuration of the elements of first transition series.2. Write the general state electronic configuration (s, p, d, f) of the elements of the firsttransition series (z=21 to 30) indicating the number of unpaired electrons in each case.3. Give the names, symbols and electronic configuration of the elements of second transitionseries.4. Discuss the trends and variation in oxidation states (valency) of transition metals.5. Explain the magnetic properties of transition metals.6. What do you understand by diamagnetism and paramagnetism.14.2.2 Electronic StructureElectronic distribution of d-block elements: