For K+ and Br find the radius ratio of K+ ion to Br ion and on this basis predict the shape of crystal geometry of KBr. Draw a diagram indicating the arrangement of K+ and Br ions in the crystal of KBr.
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Ionic radius ratio is defined as the ratio of the radius of cation to the radius of the anion.
--->Ionic Radius ratio helps us in determining the coordination number.
---->It gives us clues regarding the nature of crystal structure of Ionic substance.
In K⁺/Br⁻ radius of K⁺/radius of Br⁻ =133pm/196pm =0.678
Structure :
As the KBr ionic radius is in the range of 0.414 to 0.732
Therefore The lattice structure of KBr is same as NaCl type Crystal structure and octahedral geometry.
--->Thus KBr has rock salt structure---
--->Therefore coordination number of each ion is 6.
--->The Lattice structure consist of a face centered cube of Br- ions with a K + ion occupying each of the octahedral holes.
--->Ionic Radius ratio helps us in determining the coordination number.
---->It gives us clues regarding the nature of crystal structure of Ionic substance.
In K⁺/Br⁻ radius of K⁺/radius of Br⁻ =133pm/196pm =0.678
Structure :
As the KBr ionic radius is in the range of 0.414 to 0.732
Therefore The lattice structure of KBr is same as NaCl type Crystal structure and octahedral geometry.
--->Thus KBr has rock salt structure---
--->Therefore coordination number of each ion is 6.
--->The Lattice structure consist of a face centered cube of Br- ions with a K + ion occupying each of the octahedral holes.
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