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VESPR theory

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Total cards: 20•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (20)

#1
Front (Question)

What does VESPR stand for?

Back (Answer)

Valence Shell Electron Pair Repulsion

#2
Front (Question)

What is the VESPR theory used to do?

Back (Answer)

Predict the shape of polyatomic molecules

#3
Front (Question)

What does the theory assume?

Back (Answer)

That electron pairs within atoms will arrange themselves as far apart as possible in order to minimise repulsion.

#4
Front (Question)

What will the groups of atoms take up?

Back (Answer)

BASIC shapes according to the specific numbers of electron pairs (numbers of atoms attached)

#5
Front (Question)

For 2 electron pairs, what would the basic shape be?

Back (Answer)

Linear

#6
Front (Question)

For 3 electron pairs, what would the basic shape be?

Back (Answer)

Trigonal planar

#7
Front (Question)

For 4 electron pairs, what would the basic shape be?

Back (Answer)

Tetrahedral

#8
Front (Question)

For 5 electron pairs, what would the basic shape be?

Back (Answer)

Trigonal bipyramidal

#9
Front (Question)

For 6 electron pairs, what would the basic shape be?

Back (Answer)

Octahedral

#10
Front (Question)

What is the bond angle for a linear shape?

Back (Answer)

180

#11
Front (Question)

What is the bond angle for a trigonal planar shape?

Back (Answer)

120

#12
Front (Question)

What is the bond angle for a tetrahedral shape?

Back (Answer)

109.5

#13
Front (Question)

What are the bond angles for a trigonal bipyramidal shape?

Back (Answer)

90 120

#14
Front (Question)

What is the bond angle for a octahedral shape?

Back (Answer)

90

#15
Front (Question)

What equation is used to calculate the number of electron pairs?

Back (Answer)

No of outer electrons on central atom+ no of electrons donated by bonded atoms /2

#16
Front (Question)

What will the presence of non-bonding pairs do?

Back (Answer)

Distort the basic shape

#17
Front (Question)

Why does the presence of non-bonding distort the basic shape?

Back (Answer)

As the repulsion is greater between a non-bonding and a bonding pair

#18
Front (Question)

What will repulsion from non-bonding pairs do?

Back (Answer)

Reduced the bond angles to less than it would be in the basic shape

#19
Front (Question)

For a positive ion, what would you do to alter the question?

Back (Answer)

Subtract 1

#20
Front (Question)

For a negative ion, what would you do to alter the question?

Back (Answer)

Add 1