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In  AB2  crystal , A2+ ion arrange in CCP manner and B- occupy all tetrahedral voids, if radius of A2+ ion is 100 pm then the radius of B- ion (in pm) is:

Option: 1

22.5


Option: 2

41.4


Option: 3

20.7


Option: 4

73.2


Answers (1)

best_answer

As we have learnt,

Tetrahedral Voids -

Voids form by touching 4 spheres, 3 in the same plane and one in lower or upper plane is known as tetrahedral void. 

\frac{r}{R}=0.225

wherein

r = radius of void

R = radius of atom

-

\frac{\text {Radius of tetrahedral void}}{\text {Radius of atom}}=0.225

\text { Radius of atom }=100 \times 0.225=22.5\ \text{pm}

 

Posted by

Nehul

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