D and F Block Elements Notes for JEE Main 2014
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Transition elements are elements whose atoms have incomplete d sub-shells or whose ions have incompletely filled d orbitals. They lie between the highly electropositive s-block elements and highly electronegative p-block elements in the periodic table. While all transition elements are d-block elements, not all d-block elements are transition elements as some like zinc, cadmium, and mercury have completely filled d orbitals. Transition elements are divided into four series based on their electronic configurations.
D and F Block Elements Notes for JEE Main 2014
- 1. d f Block Elements d Block elements A transition element may be defined as an element whose atom in the ground state or ion in common oxidation state has incomplete sub-shell, has electron 1 to 9. It is called transition element due to fact that it is lying between most electropositive (s-block) and most electronegative (p-block) elements and represents a transition from them. The general electronic configuration of this element is (n-1)1 to 10 ns 0 to 2. The definition of transition metal excludes Zn, Cd and Hg because they have complete d- orbital. Their common oxidation state is Zn++, Cd++, Hg++. They also do not show
- 2. the characteristics of transition element. Element of group 3 (Sc, Y, La and Ac) and group 12 (Zn, Cd, Hg) are called non typical transition element. First transition or 3d series Second transition or 4d-series:
- 3. Third transition or 5d-series
- 4. Fourth transition or 6d-series: Elements marked with asterisk have anomalous configurations. These are attributed to factors like nuclearelectron and electron-electron forces and stability of half filled and full filled orbital. All transition elements are d block elements but all d block elements are not transition elements.
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