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• The octet rule is a chemical rule of thumb that reflects observation that atoms of main-group elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electron configuration as a noble gas
• There are five P–Cl sigma bonds inPCl5. Three P–Cl bonds lie in one plane and make an angle of 120° with each other. These bonds are calledequatorial bonds. As the axial bondpairs suffer more repulsion from theequatorial bond pairs, axial bonds are slightly longer than equatorial bond.
• A result ofHydrogen bonding, a H-atom links the two electronegative atoms simultaneously, one by a covalentbond and the other by a hydrogen bond. Hence it is said to form ahydrogen bridge. Hydrogen bond is aweak bond, but it is stronger than van-der Waals forces.
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