Astatiini
85
At
Ryhmä
17
Jakso
6
Lohko
p
Protonia
Elektronit
Neutronia
85
85
125
Yleiset ominaisuudet
Järjestysluku
85
Atomipaino
[210]
Massaluku
210
Luokka
Halogeenit
Väri
Hopea
Radioaktiivisuus
Kyllä
From the Greek astatos meaning unstable
Kiderakenne
Ei saatavilla
Historia
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.
Elektroneja elektronikuorilla
2, 8, 18, 32, 18, 7
Orbitaalirakenne
[Xe] 4f14 5d10 6s2 6p5
Astatine is preferentially concentrated in the thyroid gland
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
7 g/cm3
Sulamispiste
575,15 K | 302 °C | 575,6 °F
Kiehumispiste
610,15 K | 337 °C | 638,6 °F
Sulamislämpö
6 kJ/mol
Höyrystymislämpö
40 kJ/mol
Ominaislämpökapasiteetti
-
Esiintyvyys maankuoressa
Ei saatavilla
Esiintyvyys maailmankaikkeudessa
Ei saatavilla
CAS-numero
7440-68-8
PubChem CID-numero
Ei saatavilla
Atomiominaisuudet
Atomisäde
-
Kovalenttisäde
150 pm
Elektronegatiivisuus
2,2 (Paulingin asteikko)
Ionisoitumispotentiaali
9,3 eV
Moolitilavuus
30 cm3/mol
Lämmönjohtavuus
0,017 W/cm·K
Hapetusluvut
-1, 1, 3, 5, 7
Käyttö
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
Isotooppi
Vakaat isotoopit
-Epävakaat isotoopit
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