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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
the four block of periodic table is classified on the base there electonic configuration the group 1 / 1A & 2 / 2B together with hydrogen form s-block elements.they have 1 / 2 electrons in their outer most shell.the group 3A / 3 to 7A / 17 & zero group together form P-block they have 3-8 electrons in there outer most oshell.the group 1B / 3-7B / 12 ...