Ar
Argon is a Noble Gases element with the symbol Ar and atomic number 18. Located in period 3, group 18 (p-block), it has an atomic weight of 39.95 u and is classified as a gas at standard temperature and pressure. First identified in 1894 by Lord Rayleigh in England. Argon has an electron configuration of [Ne] 3s² 3p⁶ with 3 electron shells containing 2, 8, 8 electrons respectively. It is commonly used in: welding shield gas, light bulbs, laser surgery.
氩是一种稀有气体元素，符号为Ar，原子序数为18。位于第3周期，第18族（p区），原子量为39.95 u，在标准温度和压力下为气体。于1894 年首次被确认，由Lord Rayleigh发现。氩的电子排布为[Ne] 3s² 3p⁶，具有3个电子层，分别含有2、8、8个电子。常见用途包括：焊接保护气，灯泡，激光手术。
Basic Properties基本属性
- Atomic Number原子序数
- 18
- Atomic Weight原子量
- 39.95 u
- Category分类
- Noble Gases稀有气体
- State at STP标准状态
- Gas气体
- Period周期
- 3
- Group族
- 18
- Block区
- p-blockp区
Physical Properties物理性质
- Melting Point熔点
- -189.3°C
- Boiling Point沸点
- -185.8°C
- Density密度
- 0.0017837 g/cm³
- Crystal Structure晶体结构
- Face-Centered Cubic (FCC)面心立方
- Atomic Radius原子半径
- 71 pm
- Ionic Radius离子半径
- —
- Electronegativity电负性
- —
Electron Configuration电子排布
- Config电子构型
- [Ne] 3s² 3p⁶
- Shells电子层
- 2, 8, 8
- Oxidation States氧化态
- 0
Electron Shells电子层结构
Discovery发现历史
- Year年份
- 18941894 年
- Discoverer发现者
- Lord Rayleigh
- Country国家
- England英国
Uses & Applications用途
Welding shield gas, light bulbs, laser surgery
焊接保护气，灯泡，激光手术
Common Compounds常见化合物
—
—
Room Temperature常温特性
colorless gas
无色气体
Did You Know? 你知道吗？
The name Argon comes from Ar and it was first identified in 1894.
氩的名称来源于其符号Ar，于1894年首次被确认。
Memory Aid记忆口诀
The lazy one (from Greek argos)
最常用的保护气
Appearance外观
colorless gas
无色气体
Safety Information安全须知
- Generally inert and non-toxic. Asphyxiation risk only in confined spaces at high concentrations.
- 通常为惰性无毒气体。仅在密闭空间高浓度时有窒息风险。