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

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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?

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