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D-block elements: the transition metals in the middle of the periodic table D-electron: responsible for bonding and reactivity Electron configuration: arrangement of electrons in the orbitals of metals
Division of Periodic Table into s-, p-, d- and f blocks on the Basis of Electronic Configurations. The long form of periodic table can be divided into four main blocks. These are s-, p-, d- and f-blocks. The division of elements into blocks is primarily based upon their electronic configuration as shown in Fig. 6.2.