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Give any two limitations of octet rule

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(a) It fails to explain the incomplete octet of the central atom.

Examples: The central atom Li, Be and B in LiCl, BeCl2 and BCl3 have 1,2 and 3 valence electrons only respectively. 

(b) The octet rule is not satisfied for the atoms in a molecule having an odd no of electrons.

Examples: NO and NO2 

(c) The octet rule cannot be applied in case of elements in and beyond the third period of the periodic table since these elements have more than 8 electrons. 

Examples: PF5, SF6,H2SO4 etc., 

(d) This rule fails to explain the shape and relative stability of molecules. 

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