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Grade: 12
A unit cell has 14 chloride ions . How many Na+ ions are present? 
6 years ago

Answers : (1)

Vasantha Kumari
askIITians Faculty
38 Points

In the rock salt structure Na+ and Cl ions are alternatively arranged such that Clion is surrounded by six NA+ ions and similarly Na+ ion is surrounded by six chloride ions. In other words the ions are capable of achieving a co-ordination number of 6.

The given figure clearly illustrates the unit cell structure of NaCl with 14 Cl and 13 Na+ ions. Thus, there are four NaCl molecules per unit cell.

There are Cl-ions at the positions 0,0,0; 1/2,1/2,0; 1/2,0,1/2; and 0,1/2,1/2. .

There are Na+ions at the positions 1/2,1/2,1/2; 1/2,0,0; 0,1/2,0; and 0,0,1/2.

Thanks & Regards,

Vasantha Sivaraj,

askIITians faculty

6 years ago
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