Editing Roentgenium (section)

===Physical and atomic===
Roentgenium is expected to be a solid under normal conditions and to crystallize in the [[body-centered cubic]] structure, unlike its lighter [[congener (chemistry)|congeners]] which crystallize in the [[face-centered cubic]] structure, due to its being expected to have different electron charge densities from them.<ref name="bcc" /> It should be a very heavy metal with a [[density]] of around 22–24&nbsp;g/cm<sup>3</sup>; in comparison, the densest known element that has had its density measured, [[osmium]], has a density of 22.61&nbsp;g/cm<sup>3</sup>.<ref name="density" /><ref name="kratz" /> The atomic radius of roentgenium is expected to be around 114&nbsp;pm.<ref name="Darleane"/>