Define radius ratio. Give the limiting r...

Define radius ratio. Give the limiting radius ratio value for a co-ordination number of 6.

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Radius ratio is defined as the ratio of the radius of the cation to that of anion in any ionic crytal.
OR
Radius ratio `= (r_+)/(r_-)`
Where `r_+ and r_-` are ratio of cation and anion respectively .
0.414 to 0.732 .

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The limiting radius ratio for tetrahedral shape is

0.225 to 0.414

0.414 to 0.732

0 to 0.155

0.155 to 0.225

Define radius ratio. Give the limiting radius ratio value for a co-ordination number of 6.

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The limiting radius ratio for tetrahedral shape is

The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. its coordination number is

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