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- Help me answer: The edge length of a face centred cubic cell of an ionic substance is 508 pm . If the radius of the cation is 110 pm , the radius of the anion is :
The edge length of a face centred cubic cell of an ionic substance is 508 pm . If the radius of the cation is 110 pm , the radius of the anion is :
- Option 1)
144 pm
- Option 2)
288 pm
- Option 3)
398 pm
- Option 4)
618 pm
Answers (1)
As learnt in
Centered unit cell -
In centered unit cell, constituent particles are present in position other than corners in addition to corners.
- wherein
Three types: face centered, body centered, end centered.
For fcc unit cell, 2 (radius of cation+ radius of anion) = edge length
Therefore (110+ra) =
Option 1)
144 pm
Correct option
Option 2)
288 pm
Incorrect option
Option 3)
398 pm
Incorrect option
Option 4)
618 pm
Incorrect option
View full answer
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