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Topic 5: Predicting Molecular Shapes with VSEPR

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

Lewis Theory

Back (Answer)

A covalent bond is formed when 2 neighbouring atoms share an electron pair

#2
Front (Question)

Octet Rule

Back (Answer)

Atoms share electron pairs until they have acquired an octet of valence electrons

#3
Front (Question)

VSEPR Theory stands for … It predicts …

Back (Answer)

Valence Shell Electron Pair Repulsion Theory Molecular geometry + deviations, bond lengths and angles

#4
Front (Question)

Regions of enhanced electron density arange themself …

Back (Answer)

as far as way as possible from eachother (lone pairs, bonding pairs, unpaired electrons)

#5
Front (Question)

5 VSEPR Theory rules 1. Stereochemistry is determined by … 2. Relative strength of main interactions are: … 3. Geometry is determined only from … 4. Bonding pair sizes: … 5. The size of a bonding pair decreases with …

Back (Answer)

… valence shell electron pairs arranging themselves to minimise repulsions … lp-lp > lp-bp > (bp-radical) > bp-bp … the number of σ-pairs (bonding ) + lone pairs. … A≡B > A=B > A-B … increasing electronegativity of the ligand

#6
Front (Question)

How to use VSEPR Theory: Determine the … and how many … it has Add total number of … donated by … Adjust for any … Divide by 2 = …. Decide how to distribute the …

Back (Answer)

central atom (usually least electronegative) valence shell electrons electrons ligands charge number of pairs lone + bonding pairs

#7
Front (Question)

2-coordinate shape + draw (2)

Back (Answer)

linear (0/3 LP) bent (1/2 LP)

#8
Front (Question)

3-coordinate shape + draw (3)

Back (Answer)

trigonal planar (0 LP) t-shapes (2 lone pairs at equatorial positions) trigonal pyramidal (1 LP)

#9
Front (Question)

4-coordinate shape + draw (3)

Back (Answer)

tetrahedral (0 LP) square planar (2 LP) saw horse (1 LP)

#10
Front (Question)

5-coordinate shape + draw (2)

Back (Answer)

trigonal bipyramidal (0 LP) square pyramidal (1 LP)

#11
Front (Question)

6-coordinate shape + draw (2)

Back (Answer)

octahedral (0 LP) trigonal prismatic (0 LP)

#12
Front (Question)

Linear Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

2 sp 180

#13
Front (Question)

Trigonal planar Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

3 sp2 120

#14
Front (Question)

Tetrahedral Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

4 sp3 109.5

#15
Front (Question)

Trigonal bipyramidal Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

5 sp3d 90,120

#16
Front (Question)

Octahedral Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

6 sp3d2 90

#17
Front (Question)

Pentagonal bipyramidal Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

7 sp3d3 72,90

#18
Front (Question)

Bent Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

3/4 sp2/sp3 119/104.5

#19
Front (Question)

T-shaped Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

5 sp3d 90/180

#20
Front (Question)

Trigonal pyramidal Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

4 sp3 107

#21
Front (Question)

Saw horse Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

5 sp3d 90/120/180

#22
Front (Question)

Square pyramidal Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

6 sp3d2 90/180

#23
Front (Question)

Octahedral Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

6 sp3d2 90/180

#24
Front (Question)

Trigonal prismatic Number of sigma-bonding & lone pairs Hybridisation Bond angles

Back (Answer)

6 sp3d2 60/120