Nyholm and Gillespie explains the shapes of molecules for _.
Correct answer: B. Non-transition elements
- A. Transition elements
- B. Non-transition elements
- C. Only alkali metals
- D. Alkaline earth metals
Explanation
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 of electrons 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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Chemical bonding explains molecular shape through VSEPR theory and distinguishes sigma bonds from pi bonds. Questions involve hybridization, bond angles, dipole moment and bond energy, including how electron-pair repulsion determines geometry and how bond polarity differs from the overall polarity of a molecule.
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