9. (15 points) Chromium (Cr) has a body-centered cubic (BCC) crystal structure. Use the data

below to answer the questions which follow.

Avogadro's Number = 6.023* 1023 atoms/mole

Atomic Number = 24

Atomic Mass = 52.00 g/mole

Lattice constant (a) = 0.289 nm

(a) What is the atomic radius of chromium?

(b) What is the linear density in the [1 0 1] direction.

(c) What is the planar density of the (011) plane?