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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
Periodic Table s p d f Blocks. Periodic table is divided into four blocks, and elements are placed into these blocks based on the sub-shell in which their last electron enters. This classification divides the elements into four types s-, p-, d- and f- block elements.