アルゴン
18
Ar
族
18
周期
3
ブロック
p
陽子
電子
中性子
18
18
22
一般特性
原子番号
18
原子量
39.948
質量数
40
カテゴリ
希ガス
色
無色
放射性
いいえ
From the Greek argos, inactive
結晶構造
面心立方格子
歴史
Argon was suspected to be present in air by Henry Cavendish in 1785.
It was not isolated until 1894 by Lord Rayleigh and Sir William Ramsay in Scotland.
Argon became the first member of the noble gases to be discovered.
In 1957, IUPAC agreed that the symbol should change from A to Ar.
It was not isolated until 1894 by Lord Rayleigh and Sir William Ramsay in Scotland.
Argon became the first member of the noble gases to be discovered.
In 1957, IUPAC agreed that the symbol should change from A to Ar.
電子殻
2, 8, 8
電子配置
[Ne] 3s2 3p6
Argon makes a distinctive blue-green gas laser
物理特性
相
気体
密度
0.0017837 g/㎝3
融点
83.8 K | -189.35 °C | -308.83 °F
沸点
87.3 K | -185.85 °C | -302.53 °F
融解熱
1.18 kJ/mol
蒸発熱
6.5 kJ/mol
熱容量
0.52 J/g·K
地殻中における存在比
0.00015%
宇宙空間における存在比
0.02%
CAS登録番号
7440-37-1
PubChem CID番号
23968
原子特性
原子半径
71 pm
共有結合半径
106 pm
電気陰性度
-
イオン化エネルギー
15.7596 eV
モル体積
22.4 ㎝3/mol
熱伝導率
0.0001772 W/㎝·K
酸化数
0
用途
Argon gas is used to fill conventional incandescent and fluorescent light bulbs.
Argon is also used as an inert gas shield for arc welding and cutting, as blanket for the production of titanium and other reactive elements.
It is used as a protective atmosphere for growing silicon and germanium crystals.
Argon is also used as an inert gas shield for arc welding and cutting, as blanket for the production of titanium and other reactive elements.
It is used as a protective atmosphere for growing silicon and germanium crystals.
Argon is considered to be non-toxic
同位体
安定同位体
36Ar, 38Ar, 40Ar不安定同位体
30Ar, 31Ar, 32Ar, 33Ar, 34Ar, 35Ar, 37Ar, 39Ar, 41Ar, 42Ar, 43Ar, 44Ar, 45Ar, 46Ar, 47Ar, 48Ar, 49Ar, 50Ar, 51Ar, 52Ar, 53Ar