Astatine (At)

General Properties

Symbol At
Atomic Number 85
Atomic Weight (210)
Group
17 (fluorine family)
VIIB (IUPAC), VIIA (CAS)
Solid, Halogen, Radioactive, Synthetic, Nonmetal
Period 6
Block p

Physical Properties

Density --
Atomic Volume cm3/mole
Atomic Radius 1.45 angstroms
Covalent Radius 142 pm
Crust Abundance None
Crystal Structure Unknown
Color Silver

Electrons & Oxidation

Oxidation States
Electrons Per Shell 2 8 18 32 18 7
Electron Configuration [Xe] 4f14 5d10 6s2 6p5
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p5
Orbital Diagram
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s
↿⇂
4p
↿⇂
↿⇂
↿⇂
4d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4f
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
5s
↿⇂
5p
↿⇂
↿⇂
↿⇂
5d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
5f
 
 
 
 
 
 
 
6s
↿⇂
6p
↿⇂
↿⇂
↿ 
6d
 
 
 
 
 
6f
 
 
 
 
 
 
 

Nuclear

Radioactive Yes
Half Life 8.06 h
Lifetime 11.7h
Decay Beta Plus Decay

Media

Planetary Bohr Model of Astatine (At)
Lewis Dot Diagram of Astatine (At)
Description
Unstable, radioactive member of the halogen group.
Uses
Since its isotopes have such short half-lives there are no commercially significant compounds of astatine.
Sources
Does not occur in nature. Similar to iodine. Produced by bombarding bismuth with alpha particles.
Pronounciation (English)
AS-teh-teen

Translations

Afrikaans Astaat
Aragonese Astato
العربية استاتين
Armãneashte Astatu
asturianu Astatu
azərbaycan dili Astat
български Астатин
বাংলা অ্যাস্টাটিন
brezhoneg Astat
bosanski Astat
Byelorussian Астат
Cebuano Astato
čeština Astat
Chuvash Астат
Cymraeg Аstat
dansk Astat
Deutsch Astat
Ελληνικά Αστατο
English Astatine
esperanto Astato
español Astato
eesti Astaat
euskara Astatoa
فارسی آستاتین
suomi Astatiini
føroyskt Astatan
français Astate
furlan Astat
West-Frysk Astaat
Gaeilge Astaitín
Gàidhlig Astaitain
galego Astato
ગુજરાતી ઍસ્ટેટીનનો
Gaelg Astaçheen
Hakka Chinese Ngo (砈)
עברית אסטטין
हिन्दी एस्टाटिन
hrvatski Astat
magyar Asztácium
հայերեն Աստատ
Indonesia Astatin
íslenska Astat
italiano Astato
日本語 アスタチン
ქართული ასტატი
کٲشُر Astat
қазақ тілі Астатин
한국어 아스타틴
Kurdish Astatin
Komi Астат
kernewek Astatyn
кыргызча Астатин
Latin Astatium
Lëtzebuergesch Astat
Lombard Àstat
lingála Atati
lietuvių Astatinas
latviešu Astats
Mari Астат
Maori Astatine
македонски Астат
മലയാളം ആസ്റ്ററ്റീന്‍
монгол Астат
Мокшан Астата
Bahasa Melayu Astatin
Malti Astatin, ²Astatu
Nahuatl Astato
Nederlands Astaat
norsk Astat
Occitan Astat
ирон Астат(ин)
polski Astat
português Astato
Runasimi Astatu
română Astatin
русский Астат(ин)
slovenčina Astat
slovenščina Astat
Samoan Astatimi
Samogitian Astatis
shqip Astat
српски Астат
Southern Sotho Astatine
svenska Astat
Kiswahili Astatini
தமிழ் அஸ்தாதைன்
Tajik Астат
ไทย แอสทาทีน
Türkçe Asatatin
ئۇيغۇرچە ئاستاتىن
українська Астат
o‘zbek Astat
Tiếng Việt Astatin
Võro Astaat
中文

History

Discovered In
1940
Discovered By
Dale Corson, MacKenzie, Segre
Discovered At
California, USA
Word Origin
From the Greek word "astatos" meaning "unstable"