Questions: Please note that "geometry" refers to the molecular or ionic geometry. A. What is the electron-pair geometry for Be in BeCl2 ? There are lone pair(s) around the central atom, so the geometry of BeCl2 is . B. What is the electron-pair geometry for Si in SiCl4 ? There are lone pair(s) around the central atom, so the geometry of SiCl4 is .

Please note that "geometry" refers to the molecular or ionic geometry.
A. What is the electron-pair geometry for Be in BeCl2 ?

There are lone pair(s) around the central atom, so the geometry of BeCl2 is .
B. What is the electron-pair geometry for Si in SiCl4 ?
There are lone pair(s) around the central atom, so the geometry of SiCl4 is .

Transcript text: Please note that "geometry" refers to the molecular or ionic geometry. A. What is the electron-pair geometry for Be in $\mathrm{BeCl}_{2}$ ? There are $\square$ lone pair(s) around the central atom, so the geometry of $\mathrm{BeCl}_{2}$ is $\square$ . B. What is the electron-pair geometry for $\mathbf{S i}$ in $\mathrm{SiCl}_{4}$ ? $\square$ There are $\square$ lone pair(s) around the central atom, so the geometry of $\mathrm{SiCl}_{4}$ is $\square$ .

Solution

Solution Steps

Step 1: Determine the Electron-Pair Geometry for Be in $\mathrm{BeCl}_{2}$

The electron-pair geometry is determined by the number of regions of electron density around the central atom. In $\mathrm{BeCl}_{2}$, beryllium (Be) is the central atom. Beryllium forms two bonds with chlorine atoms and has no lone pairs. Therefore, there are two regions of electron density.

Step 2: Determine the Molecular Geometry for $\mathrm{BeCl}_{2}$

With two regions of electron density and no lone pairs, the electron-pair geometry is linear. Thus, the molecular geometry of $\mathrm{BeCl}_{2}$ is also linear.

Step 3: Determine the Electron-Pair Geometry for Si in $\mathrm{SiCl}_{4}$

Silicon (Si) is the central atom in $\mathrm{SiCl}_{4}$. Silicon forms four bonds with chlorine atoms and has no lone pairs. Therefore, there are four regions of electron density.

Step 4: Determine the Molecular Geometry for $\mathrm{SiCl}_{4}$

With four regions of electron density and no lone pairs, the electron-pair geometry is tetrahedral. Thus, the molecular geometry of $\mathrm{SiCl}_{4}$ is also tetrahedral.

Final Answer

A. The electron-pair geometry for Be in $\mathrm{BeCl}_{2}$ is $\boxed{\text{linear}}$.There are $\boxed{0}$ lone pair(s) around the central atom, so the geometry of $\mathrm{BeCl}_{2}$ is $\boxed{\text{linear}}$.

B. The electron-pair geometry for Si in $\mathrm{SiCl}_{4}$ is $\boxed{\text{tetrahedral}}$.There are $\boxed{0}$ lone pair(s) around the central atom, so the geometry of $\mathrm{SiCl}_{4}$ is $\boxed{\text{tetrahedral}}$.

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