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Vaishali Gupta posted an Question
July 13, 2021 • 18:59 pm 10 points
  • CSIR NET
  • Chemical Sciences

Highest electronegativity. how the radius ratio is related with the co-ordination number and structure of ionic crystal? ans. the permitted coordinati

highest electronegativity. How the radius ratio is related with the co-ordination number and structure of ionic crystal? Ans. The permitted coordination number and structural arrangement of anions around cations for different rIr ratio are given in Table: Limiting Radius Ratio, r Permitted Co- Structural Example ordination Numbe r Arrangement 0-155 0 255 3 Plane Trigonal BO3 0-255-0-414 4 Tetrahedral ZnS 0-414-0.732 6 Octahedral NaCl 0-732 1.00 8 Cubic CsCI

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  • Gunjan Best Answer

    see radius ratio is the ratio or radius of cation to that of the radius of anion I. e. r+/r- so if you think clearly the radius ratio is basically telling you the amount of space occupied by cation to that of the amount of space occupied by anion ... which indirectly tells the amount of space left empty in a crystal lattice.... this empty space is basically void so in a nutshell, by calculating the radius ratio you can indirectly tell the type of voids present in the lattice. as soon as the type of void is found, one can easily perdict the coordination number and type of lattice. (to be more precise, different voids have some precise size, so by knowing the range of empty space via r+/r- one can tell the void) I'll share a image with you to understand it more clearly in the image you can see if the radius ratio comes within 0- 0.15 means it is a linear lattice ratio between 0.155 - 0.225 suggests a triangular void and so on

    cropped4882476217291155524.jpg
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