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The expanded octet Elements in and beyond the third period of the periodic table have, apart from 3s and 3p orbitals, 3d orbitals also available for bonding. In a number of compounds of these elements there are more than eight valence electrons around the central atom. This is termed as the expanded octet. Obviously the octet rule does not apply in such cases. Some of the examples of such compounds are: PF). SF, H,50, and a number of coordination compounds. LOF 10: -O-5--0-H 0: PT. SF 12 electrons around the Satan 11.50 12 electrons around the 5 atm 10 cinctrons around the Patom

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