Coordination CompoundHard

Question

Identical sphere are undergoing two-dimensional packing in square close packing and hexagonal close packing. which is correct regarding the sphere?

Options

A. The ratio of coordination number for a sphere in first case to that in second case is 2 : 3.
B.Packing in second case is more effective.
C.Packing in first case is more effective.
D.The stacking of layer on first type packing produces simple cubic structure.

Solution

In square close packing, CN = 4 whereas in hcp, CN (2D) = 6. So, the ratio is 2 : 3.

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