astatine

Astatine is a chemical element; it has symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust.

Astatine is the least reactive of the halogens but just like the rest of them it combines with hydrogen to make hydrogen astatide which dissolves in water to ...

6 dec. 2025 — Astatine (At), radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic table.

Astatine (At) is a rare and highly radioactive chemical element, classified as the heaviest member of the halogen group, which also includes fluorine, ...

Chemical element, Astatine, information from authoritative sources. Look up properties, history, uses, and more.

19 okt. 2020 — Astatine is a semimetallic radioactive element belonging to the halogen group. There are four naturally occurring isotopes. These exist only in ...

31 okt. 2025 — Astatine (At) is a rare, highly radioactive halogen with a short half-life. It is the least abundant natural element and is primarily used ...

30 juni 2023 — Astatine is the last of the known halogens and was synthesized in 1940 by Corson and others at the University of California. It is radioactive.

Astatine is defined as a radioactive element, particularly noted for its isotope Astatine-211, which emits one alpha particle per decay and has flexible ...