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Questions and Answers
What determines the shape of a molecule according to VSEPR theory?
What determines the shape of a molecule according to VSEPR theory?
- The electronegativity of the central atom
- The molecular weight of the compound
- The type of chemical bonds present
- The number of valence shell electron pairs around the central atom (correct)
Which statement best describes the treatment of multiple bonds in VSEPR theory?
Which statement best describes the treatment of multiple bonds in VSEPR theory?
- Multiple bonds are ignored in shape determination.
- Multiple bonds are considered as multiple electron pairs.
- Multiple bonds create additional repulsion between electron pairs.
- Multiple bonds are considered as a single electron pair. (correct)
Which type of electron pair interaction has the strongest repulsive effect according to VSEPR theory?
Which type of electron pair interaction has the strongest repulsive effect according to VSEPR theory?
- Lone pair – Lone pair (correct)
- Lone pair – Bond pair
- Lone pair – Lone pair and bond pair
- Bond pair – Bond pair
How are the electron pairs positioned to minimize repulsion in VSEPR theory?
How are the electron pairs positioned to minimize repulsion in VSEPR theory?
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Which statement is true regarding resonance structures and VSEPR theory?
Which statement is true regarding resonance structures and VSEPR theory?
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Study Notes
Valence Shell Electron Pair Repulsion (VSEPR) Theory
- Describes the shapes of molecules based on the repulsion between electron pairs in the valence shell of atoms.
- Proposed in 1940 by Ronald Gillespie and Ronald Nyholm.
- Further developed and redefined in 1957.
- The shape of a molecule is determined by the number of valence shell electron pairs surrounding the central atom.
- These pairs can be bonded or non-bonded.
- Electron pairs repel each other because of their negatively charged electron clouds.
- The valence shell is treated as a sphere, repelling each other to maximize the distance between them.
- A multiple bond, like a double or triple bond, is treated as a single electron pair.
- Resonance structures are still applicable to the VSEPR model.
Repulsive Interaction Order
- Repulsive interactions between lone pairs (lp) and bonding pairs (bp) are arranged by decreasing strength:
- Lone pair - Lone pair > Lone pair - Bond pair > Bond pair - Bond pair
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