Crystal Structures and Atomic Packing

Atoms don't just float around, they like a tidy place. In crystalline materials,

they line up face to face. Order in 3D repeating through the cell.

That's the unit building block. It packs the atoms well. Crystal structures neat

and tight, stacking atoms left and right. Simple cubic, BCC,

or FCC with 12 near me. Hey. Oh.

Hey, hey, hey. Simple cubic's rare to find,

only polonium's that kind. Low packing coordination six, not the strongest

mix. Body-centered cubic strong with neighbors eight around. Iron,