Shapes of Molecules (VCE SSCE Chemistry): Flashcards

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Shapes of Molecules
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VSEPR theory full name

Valence Shell Electron Pair Repulsion theory

Basic principle of VSEPR theory

Electron groups repel & arrange as far apart as possible

What counts as an electron group in VSEPR?

Covalent bond (single/double/triple) or lone pair

How many electron groups is a triple bond?

One electron group

Bond angle in tetrahedral shape

109.5°109.5°

Molecular shape of NH3\text{NH}_3 (ammonia)

Pyramidal

Molecular shape of H2O\text{H}_2\text{O} (water)

Bent

Bond angle in trigonal planar shape

120°120°

Bond angle for 2 electron groups

180°180° (linear)

Molecular shape of CO2\text{CO}_2

Linear

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