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, occurring only as the decay product of various heavier elements. All of astatine's isotopes are short-lived; the most stable is …

2024年10月16日 · Astatine (At) is a rare and highly radioactive element with atomic number 85. It is part of the halogen group (Group 17) in the periodic table, which also includes fluorine, chlorine, bromine, and iodine. Unlike the other halogens, astatine has no stable isotopes.

2025年2月19日 · Astatine (At), radioactive chemical element and the heaviest member of the halogen elements, or Group 17 (VIIa) of the periodic table. Astatine, which has no stable isotopes, was first synthetically produced (1940) at the University of California by American physicists Dale R. Corson, Kenneth R.

Astatine is a shiny dark colored element. Astatine is a radioactive element. It is a semiconductor and can have metallic properties. Astatine undergoes sublimation but less readily than iodine and have a low vapor pressure.

2025年1月21日 · Known for its scarcity and radioactivity, astatine holds a unique place in the periodic table as one of the least understood elements. Our guide unfolds the intriguing aspects of astatine, from its atomic structure and properties to its potential applications and the complex compounds it forms.

Hydrogen astatide, also known as astatine hydride, astatane, astatidohydrogen or hydroastatic acid, is a chemical compound with the chemical formula HAt, consisting of an astatine atom covalently bonded to a hydrogen atom. [4]

2021年5月7日 · Astatane | AtH | CID 23996 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.

astatane (uncountable) (inorganic chemistry) astatine hydride or hydrogen astatide, HAt.

The rarest naturally occurring element on Earth is astatine, with an atomic number of 85 and symbol At. Named after the Greek word for unstable (astatos), Astatine is a naturally occurring semi-metal that results from the decay of uranium and thorium. In its most stable form - astatine-210 - it's got a half-life of just 8.1 hours, which means ...

2017年5月24日 · Astatine is the rarest element on Earth; only approximately 25 grams occur naturally on the planet at any given time. Its existence was predicted in the 1800s, but was finally discovered about 70...