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Shapes of Molecules topic. Edexcel. Unit 2. AS Chemistry. (excluding
Carbon)


Created using a combination of Edexcel textbook, CGP revision guide, George Facer Unit Guide, and
Edexcel revision guide.

They will ask you to draw the shape, state the bond angle(s), name the type of shape for the
most basic…

Page 2

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Shapes of Molecules topic. Edexcel. Unit 2. AS Chemistry. (excluding
Carbon)


ii- 3 electron pairs around central B atom, but 4 electron pairs around central N atom, hence less
space, as the ammonia molecule has an extra pair of electrons around the central N atom.

NB: Work out the number…

Page 3

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Shapes of Molecules topic. Edexcel. Unit 2. AS Chemistry. (excluding
Carbon)




Names of molecules and drawing the structures

* Linear
eg. CO2, BeCl2, HCl

O=C=O
Cl-Be-Cl Bond angle of 180
H-Cl

* Bent ­ usually caused by lone pairs on central atom of a `linear' shape
eg. H2O, SO2




Bond…

Page 4

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Shapes of Molecules topic. Edexcel. Unit 2. AS Chemistry. (excluding
Carbon)


*Square planar
eg. XeF4, ICl4-




BA=90 BA=90

*Trigonal bipyramidal
eg. PCl5




BA = 90 and 120

*Octahedral
eg. SF6



BA = 90

*Pentagonal bipyramidal
eg. IF7




BA=90 and 72

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