Question

The pattern in Hexagonal close packing and cubic close packing are same.

Is the statement true or false?

• A. True
• B. False

Answer 1

The correct option is B False

Hexagonal close packing:-

When the tetrahedral voids of the second layer is covered by the spheres of the third layer. So that the spheres of the third layer are exactly aligned with those of the first layer, we get a pattern of spheres which is repeated in alternate layers. This pattern can be written in the form of ABAB.... pattern. This structure is called as hexagonal close packed (HCP) structure.

Cubic close packing:-

When the third layer is placed above the second layer in a manner such that its spheres cover the octahedral voids and the spheres of the third layer are not aligned with first or the second layer arrangement is called -C- type. This pattern of layers is often written as ABCABC..... This structure is called cubic close packed (CCP) structure.