Astato
85
At
Grupo
17
Perio
6
Bloko
p
Protonoj
Elektronoj
Neŭtronoj
85
85
125
Ĝeneralaj Propraĵoj
Atoma Nombro
85
Atommaso
[210]
Amasa Nombro
210
Kategorio
Halogenoj
Koloro
Arĝento
Radioaktiva
Jes
From the Greek astatos meaning unstable
Kristala Strukturo
Neniu
Historio
In 1869, existence of astatine was first predicted by Russian chemist Dmitri Mendeleev and called the element eka-iodine.
In 1940, Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè isolated the element at the University of California, Berkeley.
Instead of searching for the element in nature, the scientists created it by bombarding bismuth-209 with alpha particles.
In 1940, Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè isolated the element at the University of California, Berkeley.
Instead of searching for the element in nature, the scientists created it by bombarding bismuth-209 with alpha particles.
Elektronoj per ŝelo
2, 8, 18, 32, 18, 7
Elektrona Agordo
[Xe] 4f14 5d10 6s2 6p5
Astatine is preferentially concentrated in the thyroid gland
Fizikaj Propraĵoj
Fazo
Solido
Denso
7 g/cm3
Fandpunkto
575,15 K | 302 °C | 575,6 °F
Bolpunkto
610,15 K | 337 °C | 638,6 °F
Varmo de Fuzio
6 kJ/mol
Varmo de Vaporiĝo
40 kJ/mol
Specifa Varmo Kapacito
-
Krusta Abundo
Neniu
Universa Abundo
Neniu
CAS Nombro
7440-68-8
PubChem Kunmetita Identiga Nombro
Neniu
Atomaj Propraĵoj
Atoma Radiuso
-
Kovalenta Radiuso
150 pm
Elektronegativeco
2,2 (Pauling-skalo)
Potencialo de jonigo
9,3 eV
Atoma Volumo
30 cm3/mol
Termika Kondukto
0,017 W/cm·K
Oksidaj Ŝtatoj
-1, 1, 3, 5, 7
Aplikoj
The newly formed astatine-211 is important in nuclear medicine.
Once produced, astatine must be used quickly, as it decays with a half-life of 7.2 hours.
Astatine-211 can be used for targeted alpha particle radiotherapy, since it decays either via emission of an alpha particle.
Once produced, astatine must be used quickly, as it decays with a half-life of 7.2 hours.
Astatine-211 can be used for targeted alpha particle radiotherapy, since it decays either via emission of an alpha particle.
Astatine is highly radioactive
Izotopoj
Stabilaj Izotopoj
-Malstabilaj Isotopoj
193At, 194At, 195At, 196At, 197At, 198At, 199At, 200At, 201At, 202At, 203At, 204At, 205At, 206At, 207At, 208At, 209At, 210At, 211At, 212At, 213At, 214At, 215At, 216At, 217At, 218At, 219At, 220At, 221At, 222At, 223At