In the lithium sulphide crystal, coordination number of [tex]{\mathbf{L}}{{\mathbf{i}}^{\mathbf{+}}}[/tex]is 4 and the coordination number of [tex]{{\mathbf{S}}^{{\mathbf{2-}}}}[/tex]is 8.
Further explanation:
Crystal structure or lattice is the three-dimensional representation of atoms and molecules arranged in a specific manner. The unit cell is the tiniest part of the lattice that is repeated in all directions to yield the crystal lattice. There are 3 major types of cubic unit cells as follows:
1. The simple cubic unit cell (sc)
2. Body-centered unit cell (bcc)
3. Face-centered unit cell(fcc)
The crystal lattice formed by [tex]{\text{L}}{{\text{i}}^+}[/tex] and [tex]{{\text{S}}^{2-}}[/tex] is an antifluorite structure in which ccp/fcc unit cell is formed by anions and cation are present in all tetrahedral voids.
Ions present in tetrahedral void has a coordination number 4, therefore, [tex]{\text{L}}{{\text{i}}^+}[/tex] has coordination number 4.
[tex]{\text{L}}{{\text{i}}^+}[/tex]has +1 charge and [tex]{{\text{S}}^{2-}}[/tex]has -2 charge. Therefore the ratio of cation to anion is 1:2 thus the coordination number of anion must be twice of cation thus it is 8.
Learn more:
1. Determine molecules and polyatomic ions that cannot be adequately described using a single lewis structure.:https://brainly.com/question/6786947
2. Determine the correct structure of : https://brainly.com/question/9422880
Answer details:
Grade: Senior school
Subject: Chemistry
Chapter: Solid state
Keywords: Solid state, coordination number, Li+, S2-, lithium sulfide crystal, unit cell, simple cubic unit cell, body centered unit cell and face centered unit cell.
