Astaat
85
At
Groep
17
Periode
6
Blok
p
Protrone
Elektrone
Neutrone
85
85
125
Algemene Eienskappe
Atoom Nommer
85
Atoommassa
[210]
Massa Nommer
210
Kategorie
Halogene
Kleur
Silver
Radioaktief
Ja
From the Greek astatos meaning unstable
Kristalstruktuur
n/a
Geskiendenis
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.
Elektrone per skil
2, 8, 18, 32, 18, 7
Elektronkonfigurasie
[Xe] 4f14 5d10 6s2 6p5
Astatine is preferentially concentrated in the thyroid gland
Fisiese Eienskappe
Fase
Soliede
Digtheid
7 g/cm3
Smeltpunt
575,15 K | 302 °C | 575,6 °F
Kookpunt
610,15 K | 337 °C | 638,6 °F
Heat of Fusion
6 kJ/mol
Heat of Vaporization
40 kJ/mol
Spesifieke Hitte Kapasiteit
-
Oorvloed in die aardkors
n/a
Oorvloed in die heelal
n/a
CAS Nommer
7440-68-8
PubChem CID Nommer
n/a
Atomiese Eienskappe
Atoom radius
-
Kovalente Radius
150 pm
Elektronegatiewiteit
2,2 (Pauling scale)
Ionisasie potensiaal
9,3 eV
Atoom volume
30 cm3/mol
Termiese geleidingsvermoë
0,017 W/cm·K
Oksidasiestate
-1, 1, 3, 5, 7
Toepassings
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
Isotope
Stabiele Isotope
-Onstabiele Isotope
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