セシウム
55
Cs
族
1
周期
6
ブロック
s
陽子
電子
中性子
55
55
78
一般特性
原子番号
55
原子量
132.9054519
質量数
133
カテゴリ
アルカリ金属
色
銀色
放射性
はい
From the Latin word caesius, sky blue
結晶構造
体心立方格子
歴史
Robert Bunsen and Gustav Kirchhoff were the first to suggest finding cesium in 1860 by spectrum analysis.
They discovered cesium by its two blue emission lines in a sample of Dürkheim mineral water.
The pure metal was eventually isolated by the German chemist Carl Setterberg while working on his doctorate with Kekulé and Bunsen.
They discovered cesium by its two blue emission lines in a sample of Dürkheim mineral water.
The pure metal was eventually isolated by the German chemist Carl Setterberg while working on his doctorate with Kekulé and Bunsen.
電子殻
2, 8, 18, 18, 8, 1
電子配置
[Xe] 6s1
Cesium was the first element discovered using a spectroscope
物理特性
相
固体
密度
1.873 g/㎝3
融点
301.59 K | 28.44 °C | 83.19 °F
沸点
944.15 K | 671 °C | 1239.8 °F
融解熱
2.09 kJ/mol
蒸発熱
65 kJ/mol
熱容量
0.242 J/g·K
地殻中における存在比
0.00019%
宇宙空間における存在比
8×10-8%
CAS登録番号
7440-46-2
PubChem CID番号
5354618
原子特性
原子半径
265 pm
共有結合半径
244 pm
電気陰性度
0.79 (ポーリングの値)
イオン化エネルギー
3.8939 eV
モル体積
71.07 ㎝3/mol
熱伝導率
0.359 W/㎝·K
酸化数
-1, 1
用途
The radioactive isotope cesium-137 has a half-life of about 30 years and is used in medical applications, industrial gauges, and hydrology.
Cesium is also used in photoelectric cells and as a catalyst in the hydrogenation of organic compounds.
Cesium vapor thermionic generators are low-power devices that convert heat energy to electrical energy.
Cesium is also used in photoelectric cells and as a catalyst in the hydrogenation of organic compounds.
Cesium vapor thermionic generators are low-power devices that convert heat energy to electrical energy.
Cesium compounds are considered to be mildly toxic
同位体
安定同位体
133Cs不安定同位体
112Cs, 113Cs, 114Cs, 115Cs, 116Cs, 117Cs, 118Cs, 119Cs, 120Cs, 121Cs, 122Cs, 123Cs, 124Cs, 125Cs, 126Cs, 127Cs, 128Cs, 129Cs, 130Cs, 131Cs, 132Cs, 134Cs, 135Cs, 136Cs, 137Cs, 138Cs, 139Cs, 140Cs, 141Cs, 142Cs, 143Cs, 144Cs, 145Cs, 146Cs, 147Cs, 148Cs, 149Cs, 150Cs, 151Cs