The following table gives the crystalline structure of the most thermodynamically stable form(s) for elements that are solid at standard temperature and pressure.
The following table gives the most stable crystalline structure of each element at its melting point at atmospheric pressure (H, He, N, O, F, Ne, Cl, Ar, Kr, Xe, and Rn are gases at STP; Br and Hg are liquids at STP.)
The following table give predictions for the crystalline structure of elements 85–87, 100–113 and 118; all but radon[2] have not been produced in bulk.
The following types can be viewed as a regular buildup of close-packed layers: Precisely speaking, the structures of many of the elements in the groups above are slightly distorted from the ideal closest packing.
While they retain the lattice symmetry as the ideal structure, they often have nonideal c/a ratios for their unit cell.