What is two-dimensional coordination number in square close packing layer of a molecule?

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Solution

A coordination number is the number of ions and atoms around a central neutron or the total number of attachment locations to the central element in a molecule. The packing of constituent particles inside lattice in such a way that they occupy maximum available space in the lattice is known as Close Packing. The packing in which one sphere touches two spheres placed in two different rows one above and one below is known as square closed packaging. The coordination number here is 4.

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Similar questions

	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

What is the coordination number in a square close-packed structure in two dimensions?

(a) 2 (b) 3 (c) 4 (d) 6

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