Formula of the nickel arsenide unit cell should be identified. Concept Introduction : Hexagonal close packing and cubic close packing are the two major types of close packing of the spheres of a crystal structure. Face centered cubic close packing (FCC) and body centered cubic close packing (BCC) are the two types of cubic close packing. There are 8 corners of cubic unit cell which are occupied by single atom and shared by 8 unit cells. Also, the 12 edges are having 12 atoms and shared by 4 unit cells. The center of the cube is occupied by one atom. Atom in center cubic unit cell is not shared.

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Chapter 16, Problem 62E

Interpretation Introduction

Interpretation : Formula of the nickel arsenide unit cell should be identified.

Concept Introduction :

Hexagonal close packing and cubic close packing are the two major types of close packing of the spheres of a crystal structure.

Face centered cubic close packing (FCC) and body centered cubic close packing (BCC) are the two types of cubic close packing.

There are 8 corners of cubic unit cell which are occupied by single atom and shared by 8 unit cells. Also, the 12 edges are having 12 atoms and shared by 4 unit cells. The center of the cube is occupied by one atom. Atom in center cubic unit cell is not shared.

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