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Astatine is a rare and radioactive element with the symbol At and atomic number 85. It occurs in nature in extremely small quantities and has short-lived radioactive properties. It is difficult to observe and can only be studied in laboratory conditions.HistoryAstatine was first synthesized in 1940 by American chemists. Its name derives from the Greek word “astatos,” meaning “not stable,” due to its high radioactivity and rapid decay.Physical PropertiesAstatine has a metallic appearance, but its

Astatine is an extremely radioactive element located at position 85 in the periodic table. It was first synthesized and discovered in 1940 by a team at the University of California. Astatine derives its name from the Greek word "astatos," meaning "unstable," and is the rarest element naturally occurring in the Earth's crust. Due to its high radioactivity and instability, its properties have been studied largely through theoretical calculations and in trace quantities.Classification and Fundament