🤓 Based on our data, we think this question is relevant for Professor Ritchie's class at WPUNJ.
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.
The unit cell of nickel arsenide is shown here.
What is the empirical formula?