Assertion: Every 4th layer is identical to first layer in ccp pattern of three dimension arrangement
Reason: ABCABC…. Arrangement is present in ccp

The arrangement of the first two layers, one above the other, in hep and ccp arrangement is

The available space occupied by spheres of equal size in three dimensions in both hcp and ccp arrangement is

The available space occupied by spheres of equal size in three dimensions in both hcp and ccp arrangement is

The available space occupied by spheres of equal size in three dimensions in both hcp and ccp arrangement is

What type of close packing is observed when (a) ABAB pattern of arrangement of layers (b). ABC ABC pattern of arrangement of layers?

Iron crystallises into a crystal structure in which the layer of Fe atoms form close-packed arrangement with stacking sequence ABCABC… . What is this close-packed arrangement called? How many Fe atoms are there in the unit cell of Fe crystal?

In a hexaonal system system of cycstals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are refular hexagons, and three atoms are sandwiched in between them. A space-cilling model of this structure, called hexagonal close-paked is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spherres are then placed overt the first layer so that they toych each other and represent the second layer so that they toych each other and present the second layer. Each one of the three spheres touches three spheres of the bottom layer. Finally, the second layer is convered with a third layer identical to the bottom layer in relative position. Assume the radius of every sphere to be r . The empty space in this hcp unit cell is

In a hexaonal system system of cycstals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell are refular hexagons, and three atoms are sandwiched in between them. A space-cilling model of this structure, called hexagonal close-paked is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spherres are then placed overt the first layer so that they toych each other and represent the second layer so that they toych each other and present the second layer. Each one of the three spheres touches three spheres of the bottom layer. Finally, the second layer is convered with a third layer identical to the bottom layer in relative position. Assume the radius of every sphere to be r . The empty space in this hcp unit cell is (a) 74% (b) 48.6% (c) 32% (d) 26%