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प्रश्न
An ionic solid possesses a body-centred close-packed structure. What is the ideal radius ratio and coordination number for the structure?
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उत्तर
If an ionic solid possesses a body-centred close-packed structure, the question likely refers to a structure where ions are arranged similarly to a body-centred cubic (bcc) lattice, not to be confused with close-packed arrangements like face-centred cubic (fcc) or hexagonal close-packed (hcp).
In a bcc structure, each ion is surrounded by 8 nearest neighbors (coordination number = 8).
The cesium chloride (CsCl)-type structure typically displays this arrangement for ionic compounds.
The ideal radius ratio is `r_+/r_-` = 0.732.
The coordination number is 8.
Hence, The ideal radius ratio for a body-centred close-packed structure is greater than 0.732, and the coordination number is 8.
