Topic 2: Bonding angles

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What is special about bigger atoms about bigger atoms, allowing to form more bonding pairs?

Bigger atoms can expand their octet

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How is the shape of a molecule determined?

The shape of a molecule is determine by the number of lone pairs, electron pairs arranged to minimise repulsion. The higher the number of lone pairs → the greater the lone pair - bond pair repulsion than bond pair- bond pair repulsion → and the more the bonding angle is reduced.

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How do you calculate number of lone pairs on a bonded atom and how do you calculate total number of electron pairs respectively?

Calculations:

Use 0.5(number of outer shell electrons on central atom - number of atoms bonded to central atom) to calculate number of lone pairs
Use bonding pairs + lone pair, to find out total electron pairs

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Electron pairs: 2 Number of bonding pairs: 2 Number of lone pairs: 0

Shape?