Grade 12th passPhysical Chemistry
the cordination number ofcation and anion in fluorite CaF2 and CsCl are respectively
1 Answer
Chemistry Expert - askIITians
Coordination number in CaF2 = 8:4
In fluorite, calcium ion is present at the corners and at the face of the lattice where as Fluoride ions are present at the tetrahedral voids
Each F- ion in this structure is surrounded by 4 Ca2+ ions whereas each Ca2+ ions is surrounded by eight F- ions which are present at the corners of a cube. The coordination of the compound is 8:4 as shown in the figure
Coordination number in CsCl is = 8:8
In CsCl lattice all the Cs ions are present at the corners where as all Cl ions are present at the body centre. Thus each Cl ion ion is surrounded by 8 Cs ion present at the corner, and each Cs ion is surrounded by 8 Cl ion present at the body centre of lattice as shown in the figure
In fluorite, calcium ion is present at the corners and at the face of the lattice where as Fluoride ions are present at the tetrahedral voids
Each F- ion in this structure is surrounded by 4 Ca2+ ions whereas each Ca2+ ions is surrounded by eight F- ions which are present at the corners of a cube. The coordination of the compound is 8:4 as shown in the figure
Coordination number in CsCl is = 8:8
In CsCl lattice all the Cs ions are present at the corners where as all Cl ions are present at the body centre. Thus each Cl ion ion is surrounded by 8 Cs ion present at the corner, and each Cs ion is surrounded by 8 Cl ion present at the body centre of lattice as shown in the figure
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