Astatine is an enigmatic chemical element whose name means unstable.
Along with francium, astatine has the distinction of being the rarest naturally-occurring element on earth. Ironically, element 85 was actually synthesised in the laboratory before it was finally found in nature.
Professor Allan Blackman from Auckland University of Technology tells us everything we know about astatine – which is not much.
The Elemental podcast is celebrating 150 years since the periodic table was first published by Russian chemist Dmitri Mendeleev.
Find out more about events during the United Nation’s International Year of the Periodic Table.
Nights with Bryan Crump is also celebrating the chemical elements during their Friday night Sonic Tonic and Element of the Week.
Professor Allan Blackman is at Auckland University of Technology.