Thallium | Element 81 of the Periodic Table

Thallium is a heavy, bluish-gray metal with a reputation for being highly toxic ☠️🔬. Discovered in 1861, this element is used in electronics and specialized glass manufacturing ⚡🔍. Despite its practical applications, thallium's notoriety comes from its use in rodenticides and insecticides, making it infamous in the world of poisons 🐀🚫. Handle with care!
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[@karhukivi]

The elements from and including group 12 to the non-metals are not typical transition metals as they are soft and tend to have low melting points and even some semi-conductor properties like Bi and Sn.

[@karhukivi]

It was widely used as rat poison in the 1920s to 1940s as the crime writer of that era, Agatha Christie, knew well - it features in The Pale Horse.

[@ElsaHelenHelgason]

It also contain the toxic that must do the calculations right to production medicine without mistakes.