Astat
85
At
Guruh
17
Davr
6
Blok
p
Protonlar
Elektronlar
Neytronlar
85
85
125
Umumiy xususiyatlar
Atom raqami
85
Atom massasi
[210]
Mass raqami
210
Turkum
Galogenlar
Ranggi
Kumush
Radioaktivlik
Ha
From the Greek astatos meaning unstable
Kristall tuzilma
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.
Qobiqdagi elektronlar soni
2, 8, 18, 32, 18, 7
Elektron konfiguratsiyasi
[Xe] 4f14 5d10 6s2 6p5
Astatine is preferentially concentrated in the thyroid gland
Jismoniy xususiyatlar
Faza
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
Eritish issiqligi
6 kJ/mol
Bugʻlanish issiqligi
40 kJ/mol
Solishtirma issiqlik sigʻimi
- J/g·K
Yer po‘stidagi miqdori
Nomaʼlum
Olamdagi miqdori
Nomaʼlum
CAS raqami
7440-68-8
PubChem CID raqami
Nomaʼlum
Atom xususiyatlari
Atom radiusi
-
Kovalentlik radiusi
150 pm
Elektrmanfiylik
2,2 (Poling boʻyicha)
Ionlashish potensiali
9,3 eV
Molyar hajm
30 cm3/mol
Issiqlik oʻtkazuvchanlik
0,017 W/cm·K
Oksidlanish darajasi
-1, 1, 3, 5, 7
Qo‘llanilish sohalari
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