Cs
Caesium is a Alkali Metals element with the symbol Cs and atomic number 55. Located in period 6, group 1 (s-block), it has an atomic weight of 132.91 u and is classified as a solid at standard temperature and pressure. First identified in 1860 by Robert Bunsen in Germany. Caesium has an electron configuration of [Xe] 6s¹ with 6 electron shells containing 2, 8, 18, 18, 8, 1 electrons respectively. It is commonly used in: atomic clocks, drilling fluid, getter in vacuum tubes.
铯是一种碱金属元素，符号为Cs，原子序数为55。位于第6周期，第1族（s区），原子量为132.91 u，在标准温度和压力下为固体。于1860 年首次被确认，由Robert Bunsen发现。铯的电子排布为[Xe] 6s¹，具有6个电子层，分别含有2、8、18、18、8、1个电子。常见用途包括：原子钟，钻井液，真空管吸气剂。
Basic Properties基本属性
- Atomic Number原子序数
- 55
- Atomic Weight原子量
- 132.91 u
- Category分类
- Alkali Metals碱金属
- State at STP标准状态
- Solid固体
- Period周期
- 6
- Group族
- 1
- Block区
- s-blocks区
Physical Properties物理性质
- Melting Point熔点
- +28.44°C
- Boiling Point沸点
- +671°C
- Density密度
- 1.87 g/cm³
- Crystal Structure晶体结构
- Body-Centered Cubic (BCC)体心立方
- Atomic Radius原子半径
- 298 pm
- Ionic Radius离子半径
- 167 pm
- Electronegativity电负性
- 0.79
Electron Configuration电子排布
- Config电子构型
- [Xe] 6s¹
- Shells电子层
- 2, 8, 18, 18, 8, 1
- Oxidation States氧化态
- +1
Electron Shells电子层结构
Discovery发现历史
- Year年份
- 18601860 年
- Discoverer发现者
- Robert Bunsen
- Country国家
- Germany德国
Uses & Applications用途
Atomic clocks, drilling fluid, getter in vacuum tubes
原子钟，钻井液，真空管吸气剂
Common Compounds常见化合物
—
—
Room Temperature常温特性
golden yellow
金黄色
Did You Know? 你知道吗？
The name Caesium comes from Cs and it was first identified in 1860.
铯的名称来源于其符号Cs，于1860年首次被确认。
Memory Aid记忆口诀
The most accurate clocks use caesium
原子钟的黄金标准
Appearance外观
golden yellow
金黄色
Safety Information安全须知
- Extremely reactive with water — store under mineral oil. Can cause fire or explosion on water contact.
- 与水极度反应——储存于矿物油中。遇水可引发火灾或爆炸。