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Samenvatting 8 Covalente binding & moleculaire structuur

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December 1, 2025
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8 – Covalente bindingen & moleculaire
structuur
VSEPR-theorie
De driedimensionale structuur van moleculen hangt af van de
elektronenverdeling. De VSEPR (Valence Shell Electron Pair Repulsion)
theorie laat toe die structuur te voorspellen.

Elektronen in bindingen en elektronen in vrije-elektronen-paren (charge
clouds) proberen zich zo ver mogelijk van elkaar te positioneren in de
ruimte.

 Start van de Lewis-structuur en tel de aantallen bindingen (van
eender welke BO) en vrije-elektronenparen van het centrale atoom



2 charge clouds CO2
 Lineair Lineair & bindingshoek
van 180°

HCN
Lineair & bindingshoek
van 180°
3 charge clouds CH2O
 Trigonaal vak Trigonaal vlak &
bindingshoeken van +-
120°

SO2
Gebogen &
bindingshoeken van +-
120°
4 charge clouds CH4
 Tetraëdrisch Tetraëdrisch &
bindingshoeken van
109,5°

Het atoom bevindt NH3
zich in het centrum Trigonaal pyramidisch
& bindingshoeken van
107°

H2O
Gebogen &
bindingshoeken van

, 104,5°
5 charge clouds PCl5
 Trigonaal- Trigonaal bipyramidaal
bipyramidaal
SF4
‘seesaw’

ClF3
‘T-shaped’
6 charge clouds SF6
 Octaëdrisch Octaëdrisch

SbCl52- (ion)
Vierkantig
pyramidische vorm

XeF4
Vierkantig vlakke vorm


!!Deze theorie werkt ook voor
moleculen die geen uniek centrum
hebben!!

C2H4

 In etheen hebben beide
koolstofatomen een vlak-trigonale
structuur, zodat de hele molecule
ook vlak is




C2H6
 In ethaan hebben beide
koolstofatomen een traëdrische
structuur
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