Molecule Shapes & Geometries

Question 1

Electron Geometry

Answer 1

Arrangement of electron pairs around a given atom.

Question 2

Molecular Geometry

Answer 2

Arrangement of atoms around a given atom

Question 3

Linear-Linear

Answer 3

Electron groups: 2

Lone pairs: 0

Question 4

What is the bond angle of linear-linear?

Answer 4

180 degrees

Question 5

Trigonal Planar- Trigonal Planar

Answer 5

Electron Groups: 3

Lone Pairs: 0

Question 6

What is the bond angle of trigonal planar- trigonal planar?

Answer 6

120 degrees

Question 7

Trigonal Planar - Bent

Answer 7

Electron groups: 3

Lone pairs: 1

Question 8

What is the bond angle of trigonal planar-bent?

Answer 8

Less than 120 degrees

Question 9

Tetrahedral - Tetrahedral

Answer 9

Electron Groups: 4

Lone Pairs: 0

Question 10

What is the bond angle of tetrahedral - tetrahedral?

Answer 10

109.5 degrees

Question 11

Tetrahedral - Trigonal Pyramidal

Answer 11

Electron groups: 4

Lone Pairs: 1

Question 12

What is the bond angle of tetrahedral - trigonal pyramidal?

Answer 12

Less than 109 degrees

Question 13

Tetrahedral - Bent

Answer 13

Electron Groups: 4

Lone Pairs: 2

Question 14

What is the bond angle of tetrahedral bent?

Answer 14

Less than 109 degrees

Question 15

What are the different electron geometries and given values?

Answer 15

Linear: 2 electron groups

Trigonal Planar: 3 electron groups

Tetrahedral: 4 electron groups

Question 16

Define an electron group

Answer 16

Any bond (single, double, triple) and any pair of atoms

• Single atoms do not count

Question 17

What theory is used to describe the geometries of molecules?

Answer 17

VSEPR Theory

Question 18

VSEPR Theory

Answer 18

Regions of high electron density around any
single atom will be located as far as possible
due to electron repulsions.