Polonium has a lattice constant of 3.369 Å. The radioactive element is the only known atomic species that packs in the relatively unstable simple cubic structure. The value of the lattice parameter comes from the equation:
a = 2 × r = 2 × 1.67 Å = 3.369 Å
Where:
a is the lattice constant; and
r is the atomic radius.
Read more