Question

identify the molecular geometry of sih4. tetrahedral trigonal planar octahedral linear trigonal bipyramidal

Explanation:

To determine the molecular geometry of \(SiH_4\), we use the VSEPR (Valence - Shell Electron - Pair Repulsion) theory.

• Step 1: Calculate the number of valence electrons and electron - pair geometry
• Silicon (\(Si\)) has 4 valence electrons and each hydrogen (\(H\)) has 1 valence electron. So for \(SiH_4\), the total number of valence electrons is \(4+(4\times1)=8\).
• The formula for the number of electron pairs (\(n\)) around the central atom is \(n=\frac{\text{valence electrons of central atom}+\text{number of monovalent atoms attached}}{2}\). Here, \(n = \frac{4 + 4}{2}=4\).
• When \(n = 4\), the electron - pair geometry (assuming no lone pairs) is tetrahedral according to VSEPR theory.
• Step 2: Determine the molecular geometry
• In \(SiH_4\), there are no lone pairs on the silicon atom. When the electron - pair geometry is tetrahedral and there are no lone pairs, the molecular geometry is the same as the electron - pair geometry.

Answer:

tetrahedral