アスタチン
85
At
族
17
周期
6
ブロック
p
陽子
電子
中性子
85
85
125
一般特性
原子番号
85
原子量
[210]
質量数
210
カテゴリ
ハロゲン
色
銀色
放射性
はい
From the Greek astatos meaning unstable
結晶構造
該当なし
歴史
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.
電子殻
2, 8, 18, 32, 18, 7
電子配置
[Xe] 4f14 5d10 6s2 6p5
Astatine is preferentially concentrated in the thyroid gland
物理特性
相
固体
密度
7 g/㎝3
融点
575.15 K | 302 °C | 575.6 °F
沸点
610.15 K | 337 °C | 638.6 °F
融解熱
6 kJ/mol
蒸発熱
40 kJ/mol
熱容量
-
地殻中における存在比
該当なし
宇宙空間における存在比
該当なし
CAS登録番号
7440-68-8
PubChem CID番号
該当なし
原子特性
原子半径
-
共有結合半径
150 pm
電気陰性度
2.2 (ポーリングの値)
イオン化エネルギー
9.3 eV
モル体積
30 ㎝3/mol
熱伝導率
0.017 W/㎝·K
酸化数
-1, 1, 3, 5, 7
用途
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
同位体
安定同位体
-不安定同位体
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