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//variable declaration
n=4
M=58.5 //Molecular wt. of NaCl
N=6.02*10**26 //Avagadro number
rho=2180 //density
//Calculations
a=((n*M)/(N*rho))**(1/3)
s=a/2
//Result
printf('a=%0.3f*10**-9 metre\n",(a/10**-9))
printf('spacing between the nearest neighbouring ions =%0.3f nm",(s/10**-9))
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