The face centered cubic (FCC) unit cell begins with a totally different layer, one that is packed much more efficiently. This figure shows the basic layer that will be repeated throughout the entire ...

The electronic configuration of magnesium is (Ne)(3s) 2, and the atomic radius is 0.16 nm. Magnesium has an hcp lattice with a = 0.321nm and c = 0.521 nm. The diagram shows a schematic unit cell.