Thallium is most famous for some infamous poisoned family cases, and used to be used as rat poison.
It is highly toxic because it ‘looks’ like potassium to mammalian bodies.
Its appearance in the Agatha Christie novel ‘The Pale Horse’ solved a medical mystery, says Professor Allan Blackman from the Auckland University of Technology, in episode 84 of Elemental.
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.
Professor Allan Blackman is at Auckland University of Technology.