closed packing in 3D

The difference in coordination numbers of hexagonal close packing in 3D and square close packing in 2-D, of identical spheres is:

Interstitial Voids||Planar Voids ||Triangular|| Square Planar Voids||Non Planar Voids ||Tetrahedral|| Octahedral||Cubical Voids||Ratio for each type OF void||Close packing in 3D||ABAB Packing||HCP Packing ABCABC||CCP Packing

Assertion: Hexagonal close packing in more light than cubic close packing. Reason: Hexagonal close packing has C.N of 12 whereas cubic close packing has C.N. of 8.

Mathc the type of packing given in Column I with the itmes given in Column II. Column -I (i) square close packing in two dimensions (ii) Hexagonal close packing in two dimensions (iii) Hexagonal close packing in three dimensions (iv) Cubic close packing in three dimensions Column -II (a) Triagnular voids (b) Pattern of spheres is reapted in every fourth layer (c) Coordination number -4 (d) Pattern of sphere is reapeated i alternate layers.

The co-ordination number in 3D-hexagonal close packing is

2D and 3D closed packing

The ratio of cations to anion in a octahedral close packing is :

Close packing in Crystal||1-D Close Packing