The alpha form of solid polonium has a simple cubic crystal structure with an edge length of 335.2 picometres. The beta form of polonium is rhombohedral; it has been reported in the chemical literature, along with the alpha form, several times. A picture of it is present on the web. Two papers report X-ray diffraction experiments on polonium metal.The first report of the crystal structure of polonium was done using electron diffraction.
SOLID STATE FORM
Polonium has 25 known isotopes, all of which are radioactive. They have atomic masses that range from 194 to 218 u. 210Po (half-life 138.376 days) is the most widely available. 209Po (half-life 103 years) and 208Po (half-life 2.9 years) can be made through the alpha, proton, or deuteron bombardment of lead or bismuth in a cyclotron.
ISOTOPES