ion is
169 pm and that of 
ion
is 181 pm.
(i)
What will be the co-ordination numbers of 
ions
in this structure? 1
(ii)
What is the type of crystal structure for
?
1
Answer:
(i)
In this structure, each 
ion is
surrounded by
ions
which are disposed towards the corners of a cube.
When
the unit cell is extended it can be seen that each 
ion is
surrounded by 
ions.
Thus, the co-ordination number of and is 8:
8. 1
(ii)
Radius ratio
The
radius of 
is 0.93 hence
its crystal arrangement will be a simple cubic
arrangement.
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