What is the two dimensional co-ordination number of a molecule in square close-packed layer?

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Solution

In two dimensional square close−packed layer, a molecule touches four neighbor atoms. Therefore, 4 is the two dimensional coordination number of a molecule in square close packed layer

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\frac{Z}{10} .

Z = Co-ordination number of 2D-square close packing + Co-ordination number of 2D-hcp + Co-ordination number of 3D-square close packing + Co-ordination number of 3D, ABCABC \dots\dots\dotsPacking + Co-ordination number of 3D, ABAB \dots\dots\dotsPacking

	Column I		Column II
(i)	Square close packing in two dimension	(p)	Triangular voids
(ii)	Hexagonal close packing in two dimensions	(q)	Pattern of spheres is repeated in every fourth layer
(iii)	Hexagonal close packing in three dimension	(r)	Coordination number=4
(iv)	Cubic close packing in three dimension	(s)	Pattern of spheres is repeated in alternate layers

The co-ordination number of metal crystallizing in a hexagonal close packed structure is

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