A crystalline structure has radius ratio (r+ /r-) in the range of 0.225 - 0.414. The coordination number and arrangement of anions around the cations are

Question

A crystalline structure has radius ratio (r+ /r-) in the range of 0.225 - 0.414. The coordination number and arrangement of anions around the cations are (A) 3, plane triangular (B) 6, octahedral (C) 4, tetrahedral (D) 8, cubic

Tardigrade Admin · Accepted Answer

Gustav F. Hüttig first proposed the radius ratio rule in 1920. The table below gives the relation between radius ratio, coordination number and type of structure.

Radius Ratio	Coordination number	Type of structure
< 0.155	2	Linear
0.155 - 0.225	3	Triangular Planar
0.225 - 0.414	4	Tetrahedral
0.414 - 0.732	6	Octahedral

Q. A crystalline structure has radius ratio $(r_{+} / r_{-})$ in the range of $0.225 - 0.414$ . The coordination number and arrangement of anions around the cations are

$3$ , plane triangular

$6$ , octahedral

$4$ , tetrahedral

$8$ , cubic

Q. A crystalline structure has radius ratio (r+​/r−​) in the range of 0.225−0.414. The coordination number and arrangement of anions around the cations are

3, plane triangular

6, octahedral

4, tetrahedral

8, cubic

Q. A crystalline structure has radius ratio $(r_{+} / r_{-})$ in the range of $0.225 - 0.414$ . The coordination number and arrangement of anions around the cations are

$3$ , plane triangular

$6$ , octahedral

$4$ , tetrahedral

$8$ , cubic