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Radius Ratio

Limiting radius ratio, Description: 25721.png Co-ordination number Shape Example
x < 0.155 2 Linear BeCl2
0.155 ≤ x < 0.225 3 Triangular planar BCl3
0.255 ≤ x < 0.414 4 Tetrahedral ZnS, BeO
0.414 ≤ x < 0.732 4 Square planar [PtCl4]2–
0.414 ≤ x < 0.732 6 Octahedral NaCl, CaO
0.732 ≤ x < 0.999 8 Body centered cubic CsCl
x = 1 12 Ideal fcc Fe, Al, Ag




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