When over a two-dimensional square packi...

When over a two-dimensional square packing same layers are kept in the way so that the centers are alligned in all three dimensions, coordination number of each sphere is

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The co-orination number is 6. ("4 atoms" in the plane +1 atom abvoe +1 atom above +1 atom below the particular atom).

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Three-dimensional close packing in solids is referred to as stacking the second square closed packing exactly above the first. In this tight packing, the spheres are horizontally and vertically correctly balanced. Similarly, we can obtain a simple cubic lattice by adding more layers, one above the other. This can be done in two ways. Three-dimensional close packing from two-dimensional square close-packed layers: By putting the second square closed packing exactly above the first, it is possible to form three-dimensional close packing. In this tight packing, the spheres are horizontally and vertically correctly balanced. Similarly, we can obtain a simple cubic lattice by adding more layers, one above the other.Three-dimensional close packing from two-dimensional hexagonal close-packed layers: With the assistance, of two-dimensional hexagonal packed layers, three-dimensional close packing can be obtained. The correct statement about zns crystal is:

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