砈
85
At
族
17
週期
6
區
p
個質子
電子
個中子
85
85
125
一般屬性
原子序數
85
標準原子質量
[210]
品質編號
210
類別
鹵素
顏色
銀色
放射性
是
From the Greek astatos meaning unstable
晶體結構
無法計量
歷史
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.
每個外殼的電子
2, 8, 18, 32, 18, 7
電子排布
[Xe] 4f14 5d10 6s2 6p5
Astatine is preferentially concentrated in the thyroid gland
物理性質
物態
固體
密度
7 g/cm3
熔點
575.15 K | 302 °C | 575.6 °F
沸點
610.15 K | 337 °C | 638.6 °F
熔化熱
6 kJ/mol
汽化熱
40 kJ/mol
比熱容
-
地殼豐度
無法計量
宇宙豐度
無法計量
CAS 編號
7440-68-8
Pubchem CID 編號
無法計量
原子性質
原子半徑
-
共價半徑
150 pm
電負性
2.2 (鲍林标度)
電離電位
9.3 eV
原子體積
30 cm3/mol
熱導率
0.017 W/cm·K
氧化態
-1, 1, 3, 5, 7
應用
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
同位素
穩定同位素
-不穩定同位素
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