What are the four different types of molecular geometries?
Molecular geometries (linear, trigonal, tetrahedral, trigonal bipyramidal, and octahedral) are determined by the VSEPR theory.
What are the three types of molecular geometry?
Molecule Shapes
- Linear: Linear molecules have the shape of a straight line.
- Angular: Angular, bent, or v-shaped molecules contain bond angles less than 180°.
- Trigonal Planar: Trigonal planar molecules form a roughly triangular shape in one plane.
- Tetrahedral: A tetrahedral shape is a four-faced solid shape.
What are the bond angles?
A bond angle is the angle made by three connected nuclei in a molecule. By convention, the bond angle is considered to be between 0° and 180°. Electron domains have characteristic angles and structures. For example, a central atom with two regions of electron density is considered linear with a bond angle of 180°.
What are the 6 most basic molecular shapes?
The 6 basic molecular shapes are linear, trigonal planar, angular (bent), tetrahedral, trigonal pyramidal, and trigonal bipyramidal.
What are the angles in a trigonal planar geometry?
Trigonal planar is a molecular shape that results when there are three bonds and no lone pairs around the central atom in the molecule. The pairs are arranged along the central atom’s equator, with 120° angles between them.
How do you find the molecular geometry of an angle?
1 Answer
- Write the Lewis dot structure for the molecule.
- Use the steric number and VSEPR theory to determine the electron domain geometry of the molecule.
- Use the VSEPR shape to determine the angles between the electron domains.
Why the bond angles are different?
Bond angles will deviate from their ideal values according to the rule that lone pairs repel other electrons more strongly than bonding pairs. Although lone pairs are clearly smaller than atoms, they need to be closer to the nucleus of an atom than a bonding pair.
What is the molecular geometry of SF6?
octahedral
The molecular geometry of SF6 is octahedral.
What are the bond angles for octahedral structure?
VSEPR Notation
| Number of Electron Groups | Electron-Group Geometry | Ideal Bond Angles |
|---|---|---|
| 5 | trigonal-bipyramidal | 90° |
| 180° | ||
| 6 | octahedral | 90° |
| 90° |