First slide

Crystal lattices and unit cells

Question

Calculate the value of $\frac{Z}{10}$ . Where
Z = Co-ordination number of 2D - square close packing
+
Co-ordination number of 2D-hpc
+
Co-ordination number of 3D-square close packing
+
Co-ordination number of 3D, ABCABC .. . . . Packing
+
Co-ordination number of 3D, ABAB . . . . hcp Packing

Moderate

Solution

$\begin{array}{l} Z = 4 + 6 + 6 + 12 + 12 = 40 \\ \frac{Z}{10} = \frac{40}{10} = 4 \end{array}$

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