# Question #8fe6e

Magnesium silicide, or $M {g}_{2} S i$, is an example of a compound formed by magnesium and silicon. The bond in $M {g}_{2} S i$ is considered to be polar covalent with some ionic character.
$E {N}_{S i} - E {N}_{M g} = 1.9 - 1.3 = 0.6$
As a powder, magnesium silicide crystalizes in a face-centered cubic structure. $S {i}^{4 -}$ ions will occupy the corners and the face-centered positions of the unit cell, while $M {g}^{2 +}$ ions will occupy eight spots in the interior of the cell.