We Use Cookies
We use cookies and other tracking technologies to improve your browsing experience on our website, to show you personalized content and targeted ads, to analyze our website traffic, and to understand where our visitors are coming from. For more information, please review our cookie policy and privacy policy.
By choosing I Accept, you consent to our use of cookies and other tracking technologies.

Astatine (At)

From Wikipedia, the free encyclopediaAstatine is a very rare radioactive chemical element with the chemical symbol At and atomic number 85. It occurs on Earth as the decay product of various heavier elements. All its isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours.

Astatine in the periodic table

Atomic number85
Element categoryMetalloid

Physical properties

Phase at STPSolid
Density6.35 g/cm3
Atomic weight210 u
Melting point575 K
301.85 °C
575.33 °F
Boiling point610 K
336.85 °C
638.33 °F

Atomic properties

Electronegativity (Pauling Scale)2.2
Electron affinity233 kJ/mol
Oxidation states−1, +1, +3, +5, +7
Ionization energies
1899.003 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Xe] 4f14 5d10 6s2 6p5
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p5
Electrons per shell2, 8, 18, 32, 18, 7


Discovered byDale R. Corson
Kenneth Ross MacKenzie
Emilio Segrè
Warning: Undefined variable $footer in /customers/a/d/1/periodictable.one/httpd.www/inc/footer.php on line 34