アメリシウム
95
Am
族
該当なし
周期
7
ブロック
f
陽子
電子
中性子
95
95
148
一般特性
原子番号
95
原子量
[243]
質量数
243
カテゴリ
アクチノイド
色
銀色
放射性
はい
Named after America
結晶構造
六方最密構造
歴史
Americium-241 was first identified in 1944 by Glenn T. Seaborg, Ralph A. James, Leon O. Morgan and Albert Ghiorso at the metallurgical laboratory at the University of Chicago.
It was produced by irradiating plutonium with neutrons during the Manhattan Project.
Americium was first isolated as a pure compound by Burris Cunningham in 1945, at the University of Chicago.
It was produced by irradiating plutonium with neutrons during the Manhattan Project.
Americium was first isolated as a pure compound by Burris Cunningham in 1945, at the University of Chicago.
電子殻
2, 8, 18, 32, 25, 8, 2
電子配置
[Rn] 5f7 7s2
Americium often enters landfills from discarded smoke detectors
物理特性
相
固体
密度
13.69 g/㎝3
融点
1449.15 K | 1176 °C | 2148.8 °F
沸点
2880.15 K | 2607 °C | 4724.6 °F
融解熱
該当なし
蒸発熱
該当なし
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
7440-35-9
PubChem CID番号
該当なし
原子特性
原子半径
173 pm
共有結合半径
180 pm
電気陰性度
1.3 (ポーリングの値)
イオン化エネルギー
5.9738 eV
モル体積
17.78 ㎝3/mol
熱伝導率
0.1 W/㎝·K
酸化数
2, 3, 4, 5, 6
用途
Americium is used in commercial ionization chamber smoke detectors, as well as in neutron sources and industrial gauges.
Americium-241 has been used as a portable source of both gamma rays and alpha particles for a number of medical and industrial uses.
It is also used as a target material in nuclear research to make even heavier elements.
Americium-241 has been used as a portable source of both gamma rays and alpha particles for a number of medical and industrial uses.
It is also used as a target material in nuclear research to make even heavier elements.
Americium is harmful due to its radioactivity
同位体
安定同位体
-不安定同位体
229Am, 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am