Astat
85
At
Guruh
17
Davr
6
Block
p
Protonlar
Elektronlar
Neytronlar
85
85
125
General Properties
Atom raqami
85
Atom massasi
[210]
Mass Number
210
Turkum
Galogenlar
Ranggi
Silver
Radioaktivlik
Ha
From the Greek astatos meaning unstable
Crystal Structure
Nomaʼlum
Tarix
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.
Electrons per shell
2, 8, 18, 32, 18, 7
Elektron konfiguratsiyasi
[Xe] 4f14 5d10 6s2 6p5
Astatine is preferentially concentrated in the thyroid gland
Physical Properties
Phase
Qattiq modda
Zichlik
7 g/cm3
Erish harorati
575,15 K | 302 °C | 575,6 °F
Qaynash harorati
610,15 K | 337 °C | 638,6 °F
Heat of Fusion
6 kJ/mol
Heat of Vaporization
40 kJ/mol
Solishtirma issiqlik sigʻimi
-
Abundance in Earth's crust
Nomaʼlum
Abundance in Universe
Nomaʼlum
CAS Number
7440-68-8
PubChem CID Number
Nomaʼlum
Atomic Properties
Atom radiusi
-
Kovalentlik radiusi
150 pm
Elektrmanfiylik
2,2 (Poling boʻyicha)
Ionization Potential
9,3 eV
Molyar hajm
30 cm3/mol
Issiqlik oʻtkazuvchanlik
0,017 W/cm·K
Oksidlanish darajasi
-1, 1, 3, 5, 7
Applications
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
Izotoplar
Barqaror izotoplar
-Beqaror izotoplar
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