Chemistry, asked by amanadig3350, 1 year ago

radius ratio of k+ to br- ion and find shape of kbr

Answers

Answered by prmkulk1978
8
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.


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Answered by sawakkincsem
4
Radius of K+ = 138pm
Radius of Br- = 196pm
Radius Ratio= 138/196 = 0.704
The radius ratio lies between 0.414 - 0.732
The crystal has NaCl type structure.
Crystal has 6:6 coordination number. 

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