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Title: Shapes of Molecules
Description: Aimed at A-Level/First year of undergraduate students. Gives a brief description of VSEPR (valence shell electron repulsion theory) and different molecular shapes.
Description: Aimed at A-Level/First year of undergraduate students. Gives a brief description of VSEPR (valence shell electron repulsion theory) and different molecular shapes.
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Shapes of Molecules
VSEPR (Valence Shell Electron Pair Repulsion) Theory
Regions of electron density minimise the repulsions between them by maximising the
distance between them
...
Electron pairs in valence shell orient themselves to minimise repulsion
2
...
For 5 or more electron pairs, ignore interactions > 90o relative to the central atom
4
...
Lateral spread of double bonds mean the repulsive effect lies between lone pairs
and bonding pairs:
Lone pair > Double bond > Bonding pair
Predicting Shape
1
...
Add number of central atom valence electrons (eg
...
Add total number of electrons in bonds for each atom/group attached to central atom (eg
...
For a charged central atom, +1 for each –ve charge and -1 for each +ve charge
5
...
Shapes
No
...
electron
pairs around
central atom
Shape
BeF2
5
BF3
6
CF4
7
Example
PF5
SF6
IF7
Title: Shapes of Molecules
Description: Aimed at A-Level/First year of undergraduate students. Gives a brief description of VSEPR (valence shell electron repulsion theory) and different molecular shapes.
Description: Aimed at A-Level/First year of undergraduate students. Gives a brief description of VSEPR (valence shell electron repulsion theory) and different molecular shapes.