Problem: The unit cell of nickel arsenide is shown here. What is the empirical formula?

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FREE Expert Solution

We are asked the empirical formula of Nickel Arsenide from the Unit cell given.

Nickel Arsenide follows an hcp or hexagonal closed packed unit cell which is composed of a cube with one eight atoms at each of its corners, four atoms at its edges and two atoms at the center of the cube. 

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Problem Details

The unit cell of nickel arsenide is shown here. Side view: a cube with sides of 5.10 angstroms has Ni as its corners and in the center of each edge. Within the cube are two As atoms. Top view: A rhombus with Ni as the corners has sides of 3.5 angstroms and corner angles of 120 degrees. Two As atoms are inside.

What is the empirical formula?