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Astatine
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At-85
Astatine
Post-transition metals
Â
Atomic mass:210Â u
Melting point:301.85°C (575 K)
Boiling point:336.85°C (610 K)
Discovery date:1940
Discovered by:Emilio Segrè
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Â
Astatine
Post-transition metals
Â
3D Bohr model from Signal Garden
Astatine is a chemical element with the 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.
WikipediaAtomic mass:210Â u
Melting point:301.85°C (575 K)
Boiling point:336.85°C (610 K)
Discovery date:1940
Discovered by:Emilio Segrè
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