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Asked by hrittik12d 25th October 2018, 11:26 PM
Answered by Expert
Answer:
 
Radius ratio
range
Co-ordination no. Crystal structure
0-0.115 2 linear
0.115-0.225 3 triangular planar
0.225-0.414 4 tetrahedral
0.414-0.732 6 Octahedral
0.732-0.999 8 BCC
1                12                      HCP                  
 
 Structure of crystal depends upon radius ratio.
crystal  radis of cation(A')   radius of anion(A')
 radius ratio=
radius of cation/radius of anion
 structure
RbCl  1.48  1.95   1.48/1.95= 0.75897  BCC
MgTe 0.65 2.21 0.65/2.21= 0.29411  Tetrahedral
MgO 0.65 1.40 0.65/1.40= 0.4642857  Octahedral
BaO 1.35 1.40 1.35/1.40= 0.96428 BCC
Answered by Expert 28th October 2018, 3:43 PM
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