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State the contribution of Nyholm & Gillespie in VSEPR theory. |
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Answer» Solution :Nyholm and Gillespie (1957) refined the VSEPR model by explaining the important difference between the lone pair and bonding pairs of electrons. While the lone pairs are localised on the central atom, each bonded pair is shared between TWO atoms. As a result, the lone pair electrons in a molecule occupy more SPACE as compared to the bonding pairs of electrons. This RESULTS in greater repulsion between lone pairs ofelectrons as compared to the lone pair - BOND j pair and bond pair - bon pair repulsions. These repulsion effects result in deviations- from idealised shapes and alterations in bond ANGLES in molecules. |
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