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 ...
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Astatine is a radioactive, chemical element. Its atomic number is 85, and its atomic weight is 210. It is part of the Group 17 (halogens) on the periodic ...
Astatine (85At) has 41 known isotopes, all of which are radioactive; their mass numbers range from 188 to 229 There are also 24 known metastable excited ...
Astatine compounds are compounds that contain the element astatine (At). As this element is very radioactive, few compounds have been studied.