Arrange the electron domains around the central atom to minimize repulsion. Count the total number of electron domains. **Use the angular arrangement of the chemical bonds between the atoms** to determine the molecular geometry. Keep in mind, multiple bonds (i.e., double bonds, triple bonds) count as one electron domain.

Contents

- 1 What are electron domain geometries?
- 2 How do you determine electron geometry and molecular geometry?
- 3 What do you notice about the electron domain geometries and molecular geometries when there are no lone pairs?
- 4 When you have 4 electron groups the electron geometry is tetrahedral?
- 5 What is number of electron domains?
- 6 Is electron geometry the same as molecular geometry?
- 7 What is the connection between the number of electron domains and electron geometry?
- 8 Are there any circumstances under which the molecular geometry is the same as the electronic geometry elucidate your reasons with examples?

## What are electron domain geometries?

The molecular geometries of molecules change when the central atom has one or more lone pairs of electrons. The total number of electron pairs, both bonding pairs and lone pairs, leads to what is called the electron domain geometry.

## How do you determine electron geometry and molecular geometry?

Electron-group geometry is determined by the number of electron groups. Molecular geometry, on the other hand, depends on not only on the number of electron groups, but also on the number of lone pairs. When the electron groups are all bond pairs, they are named exactly like the electron-group geometry.

## What do you notice about the electron domain geometries and molecular geometries when there are no lone pairs?

Figure 8.6. 1 shows the various molecular geometries for the five VESPR electronic geometries with 2 to 6 electron domains. When there are no lone pairs the molecular geometry is the electron (VESPR) geometry. When there are lone pairs, you need to look at the structure and recognize the names and bond angles.

## When you have 4 electron groups the electron geometry is tetrahedral?

The electron group geometry for a molecule with four electron pairs is tetrahedral, as was seen with CH4. In the ammonia molecule, one of the electron pairs is a lone pair rather than a bonding pair. Although the lone pair is not visible, it will affects the location and bond angles among other atoms in the molecule.

## What is number of electron domains?

There are two types of electron domains: 1) A bonded atom and 2) a nonponding pair of electrons. It does not matter whether a bonded atom is atached with a single, double or triple bond, each noncentral atom counts as one electron domain on the central atom. There are five basic electron domain geometries.

## Is electron geometry the same as molecular geometry?

The molecular geometry definition in chemistry is the arrangement of atoms in relation to a central atom in three-dimensional space. Electron geometry is the arrangement of electron groups. If all the electron groups are bonded, with no lone pairs, then the electron geometry and molecular geometry are the same.

## What is the connection between the number of electron domains and electron geometry?

Electron geometry, which is the geometric arrangement of the ELECTRON groups around an atom that is based on the total number of electron pairs, Electron domain geometries is the total number of electron pairs, both bonding and lone pairs.

## Are there any circumstances under which the molecular geometry is the same as the electronic geometry elucidate your reasons with examples?

The electron geometry and the molecular geometry are the same when every electron group bonds two atoms together. The presence of unbonded lone pair electrons gives a different molecular geometry and electron geometry.