. A compound XY crystallizes in BCC lattice with unit
cell edge length of 480 pm. If the radius of Y is 225 pm, then the radius of X+ is: -
A: 127.5 pm
B: 190.68 pm
C: 225 pm
D: 255 pm
Best Answer
Explanation:
We know that the sum of the ionic radii is the nearest neighbour distance d.
In case of a body centred cube,d=√3 /2 a , where is the unit cell length.
Calculating, we get d=415.68pm
Since, X+ +Y- =415.68pm
Therefore, X+ =415.68 -225.0 190.68pm
Final answer:
The correct option is B: 190.68 pm
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