55
Cs
1
週期
6
s
個質子
電子
個中子
55
55
78
一般屬性
原子序數
55
標準原子質量
132.9054519
品質編號
133
類別
鹼金屬
顏色
銀色
放射性
From the Latin word caesius, sky blue
晶體結構
Body Centered Cubic
歷史
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.
每個外殼的電子
2, 8, 18, 18, 8, 1
電子排布
[Xe] 6s1
Cs
Cesium was the first element discovered using a spectroscope
物理性質
物態
固體
密度
1.873 g/cm3
熔點
301.59 K | 28.44 °C | 83.19 °F
沸點
944.15 K | 671 °C | 1239.8 °F
熔化熱
2.09 kJ/mol
汽化熱
65 kJ/mol
比熱容
0.242 J/g·K
地殼豐度
0.00019%
宇宙豐度
8×10-8%
Cesium
圖片來源: Wikimedia Commons (Dnn87)
Cesium metal sample from the Dennis s.k collection
CAS 編號
7440-46-2
Pubchem CID 編號
5354618
原子性質
原子半徑
265 pm
共價半徑
244 pm
電負性
0.79 (鲍林标度)
電離電位
3.8939 eV
原子體積
71.07 cm3/mol
熱導率
0.359 W/cm·K
氧化態
-1, 1
應用
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 compounds are considered to be mildly toxic
同位素
穩定同位素
133Cs
不穩定同位素
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