The alloys V3Si and Cr3Si have the A15 crystal structure with space group Pm-3n . V3Si is a superconductor with a transition temperature of 17 K while Cr3Si is not a superconductor.

Comment extensively on the following structure and determine a) the content of the unit cell and the density of the crystal

b)the Cr-Si, Cr-Cr and Si-Si bond distances c) the coordination number and coordination type of Cr and Si. d) Describe any trend from the data of other compounds that have the Cr3Si-like structure.