What is the Electron Domain Geometry of SeS2
The correct answer and explanation is :
Electron Domain Geometry of SeS₂:
The electron domain geometry of selenium disulfide (SeS₂) is trigonal planar.
Explanation:
To determine the electron domain geometry of SeS₂, we follow these steps:
Step 1: Determine the Valence Electrons of Selenium (Se)
- Selenium (Se) is in Group 16 of the periodic table, so it has 6 valence electrons.
- Sulfur (S) is also in Group 16, and each sulfur atom has 6 valence electrons.
Step 2: Draw the Lewis Structure
- Selenium (Se) is the central atom because it is less electronegative than sulfur.
- Sulfur (S) atoms will bond to selenium via single bonds.
Step 3: Count Electron Domains
- Selenium forms two single bonds with two sulfur atoms.
- The selenium atom also has one lone pair of electrons.
- In total, there are three electron domains around selenium:
- Two bonding domains (from the Se-S bonds).
- One lone pair (from selenium’s non-bonding electrons).
Step 4: Determine the Electron Domain Geometry
- The electron domain geometry is determined by the total number of electron domains.
- Three electron domains result in a trigonal planar geometry according to VSEPR (Valence Shell Electron Pair Repulsion) theory.
Step 5: Determine the Molecular Geometry
- Since one of the domains is a lone pair, the molecular geometry is bent (V-shaped) rather than trigonal planar.
- However, the electron domain geometry is still trigonal planar because it considers both bonding and non-bonding electron pairs.
Conclusion
- The electron domain geometry of SeS₂ is trigonal planar.
- The molecular geometry is bent (V-shaped) due to the lone pair on selenium, which repels the bonding pairs and reduces the bond angle.