Astatin

85
At
Kumpulan
17
Kala
6
Blok
p
Proton
Elektron
Neutron
85
85
125
Ciri-Ciri Am
Nombor atom
85
Berat atom
[210]
Nombor jisim
210
Kategori
Halogen
Warna
Perak
Radioaktif
Ya
From the Greek astatos meaning unstable
Struktur hablur
Tiada
Sejarah
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.
Bilangan elektron per petala
2, 8, 18, 32, 18, 7
Konfigurasi elektron
[Xe] 4f14 5d10 6s2 6p5
At
Astatine is preferentially concentrated in the thyroid gland
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
7 g/cm3
Takat lebur
575.15 K | 302 °C | 575.6 °F
Takat didih
610.15 K | 337 °C | 638.6 °F
Haba pelakuran
6 kJ/mol
Haba pengewapan
40 kJ/mol
Muatan haba molar
-
Banyak pada kerak bumi
Tiada
Banyak pada alam semesta
Tiada
Emilio
Kredit imej: pauli.uni-muenster.de
Emilio Segrè, one of the discoverer of the element
Nombor CAS
7440-68-8
PubChem CID Number
Tiada
Ciri-Ciri Atom
Jejari atom
-
Jejari kovalen
150 pm
Keelektronegatifan
2.2 (Skala Pauling)
Kebolehan mengion
9.3 eV
Isipadu atom
30 cm3/mol
Daya pengaliran terma
0.017 W/cm·K
Keadaan pengoksidaan
-1, 1, 3, 5, 7
Aplikasi
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.
Astatine is highly radioactive
Isotop
Isotop stabil
-
Isotop tidak stabil
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