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+clc;clear;
+//Example 16.1
+//calculation of density
+
+//given values
+a=3.36*10^-10;//lattice constant in m
+M=209;//atomicmass of polonium in kg
+N=6.02*10^26;//avogadro's number
+z=1;//no of atom
+//calculation
+d=z*M/(N*a^3)
+
+disp(d,'density (in kg/m^3) is');