Show that the radius of the largest sphere that can be placed in a tetrahedral interstitial site in an fcc lattice is 0.225r1, where r1 is the radius of the atoms making up the lattice. (Hint: Consider a cube with the centers of fourspheres placed at alternate corners, and visualize the tetrahedral site at the center of the cube. What is the relationship between r1 and the length of a diagonal of a face? The length of a body diagonal?)

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Q: A hypothetical element, Ny, forms a face-centered cubic lattice with an atomic radius of 166 pm.…

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Q: the theoretical density in g/cm^3

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