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A unit cell has 14 chloride ions . How many Na+ ions are present? Explanation.
In the rock salt structure Na+ and Cl– ions are alternatively arranged such that Cl– ion 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
In the rock salt structure Na+ and Cl– ions are alternatively arranged such that Cl– ion 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
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