The valence shell electron-pair repulsion theory (abbreviated VSEPR) is commonly used to predict molecular geometry. The theory says that repulsion among the pairs of electrons on a central atom (whether bonding or non-bonding electron pairs) will control the geometry of the molecule.
- 1 Can the molecular geometry of a molecule be predicted?
- 2 What two things predict a molecules shape?
- 3 What factors affect the geometry of a molecule?
- 4 Why is it important to know the geometry of a molecule?
- 5 What molecular geometry would ph3 have?
- 6 How do you know if a molecule is tetrahedral?
- 7 When determining the molecular electron geometry of a molecule What information is required?
Can the molecular geometry of a molecule be predicted?
The VSEPR model can predict the structure of nearly any molecule or polyatomic ion in which the central atom is a nonmetal, as well as the structures of many molecules and polyatomic ions with a central metal atom. The VSEPR model is not a theory; it does not attempt to explain observations.
What two things predict a molecules shape?
The approximate shape of a molecule can be predicted from the number of electron groups and the number of surrounding atoms.
What factors affect the geometry of a molecule?
Many factors lead to variations from the ideal bond angles of a molecular shape. Size of the atoms involved, presence of lone pairs, multiple bonds, large groups attached to the central atom, and the environment that the molecule is found in are all common factors to take into consideration.
Why is it important to know the geometry of a molecule?
It is important to be able to predict and understand the molecular structure of a molecule because many of the properties of a substance are determined by its geometry. Molecular geometry may also be used to predict biological activity, to design drugs or decipher the function of a molecule.
What molecular geometry would ph3 have?
In essence, ph3 is a Drago molecule and if we look at its bond angle data it shows that the p-orbitals have an angle of 90°. Looking at its Lewis structure we can state that molecular geometry of PH3 is trigonal pyramidal.
How do you know if a molecule is tetrahedral?
For example, a molecule with two electron pairs (and no lone pairs) around the central atom has a linear shape, and one with four electron pairs (and no lone pairs) around the central atom would have a tetrahedral shape.
When determining the molecular electron geometry of a molecule What information is required?
There are three basic steps to determining the molecular shape of a molecule: Write the Lewis dot structure of the molecule. That gives you the steric number (SN) — the number of bond pairs and lone pairs around the central atom. Use the SN and VSEPR theory to determine the electron pair geometry of the molecule.