85
At
210Astatine
Appearanceunknown, probably metallic
Categorymetalloid
Discovered byDale R. Corson
Named byN/A
What element is At on the periodic table?At is the element Astatine on the periodic table.
What is the symbol for Astatine on the periodic table?The symbol for Astatine on the periodic table is At.
What does Astatine look like?To the human eye, Astatine is unknown, probably metallic.
About AstatineAstatine 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 astatine-210, with a half-life of 8.1 hours. Consequently, a solid sample of the element has never been seen, because any macroscopic specimen would be immediately vaporized by the heat of its radioactivity.Source: Wikipedia