Question

The Edge length of sodium chloride unit cell is 564 pm. If the size of cl-ion is 181 pm. The size of na+ion will be
(A)101 pm
(B)181 pm
(C)410 pm
(D)202 pm

Answer 1

Answer:

Explanation:

Correct option is

A

101 pm

From the above structure, it is clear that  

Length of edge of unit cell=R  

Cl  

−

 

​

+2R  

Na  

+

 

​

+R  

Cl  

−

 

​

 

⟹564=2R  

Na  

+

 

​

+2×181

⟹R  

Na  

+

 

​

=  

2

564−362

​

=101 pm

Hence, Option "A" is the correct answer.

Answer 2

Answer:

Explanation:

The Edge length of sodium chloride unit cell is 564 pm. If the size of cl-ion is 181 pm. The size of na+ion will be