バリウム
56
Ba
族
2
周期
6
ブロック
s
陽子
電子
中性子
56
56
81
一般特性
原子番号
56
原子量
137.327
質量数
137
カテゴリ
アルカリ土類金属
色
銀色
放射性
いいえ
From the Greek word barys, heavy
結晶構造
体心立方格子
歴史
Barium was identified as a new element in 1774 by Carl Wilhelm Scheele.
Barium was first isolated by electrolysis of molten barium salts in 1808, by Sir Humphry Davy in England.
Robert Bunsen and Augustus Matthiessen obtained pure barium by electrolysis of a molten mixture of barium chloride and ammonium chloride.
Barium was first isolated by electrolysis of molten barium salts in 1808, by Sir Humphry Davy in England.
Robert Bunsen and Augustus Matthiessen obtained pure barium by electrolysis of a molten mixture of barium chloride and ammonium chloride.
電子殻
2, 8, 18, 18, 8, 2
電子配置
[Xe] 6s2
At low doses, barium acts as a muscle stimulant
物理特性
相
固体
密度
3.594 g/㎝3
融点
1000.15 K | 727 °C | 1340.6 °F
沸点
2170.15 K | 1897 °C | 3446.6 °F
融解熱
8 kJ/mol
蒸発熱
140 kJ/mol
熱容量
0.204 J/g·K
地殻中における存在比
0.034%
宇宙空間における存在比
1×10-6%
CAS登録番号
7440-39-3
PubChem CID番号
5355457
原子特性
原子半径
222 pm
共有結合半径
215 pm
電気陰性度
0.89 (ポーリングの値)
イオン化エネルギー
5.2117 eV
モル体積
39.24 ㎝3/mol
熱伝導率
0.184 W/㎝·K
酸化数
2
用途
Barium is used as a flashed getter in vacuum tubes to remove the last traces of gases.
It is often used in barium-nickel alloys for spark plug wire.
Barium sulfate is important to the petroleum industry as a drilling fluid in oil and gas wells.
Barium is also used in medicine to detect abnormalities in the digestive system.
It is often used in barium-nickel alloys for spark plug wire.
Barium sulfate is important to the petroleum industry as a drilling fluid in oil and gas wells.
Barium is also used in medicine to detect abnormalities in the digestive system.
Water-soluble barium compounds are poisonous
同位体
安定同位体
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138Ba不安定同位体
114Ba, 115Ba, 116Ba, 117Ba, 118Ba, 119Ba, 120Ba, 121Ba, 122Ba, 123Ba, 124Ba, 125Ba, 126Ba, 127Ba, 128Ba, 129Ba, 131Ba, 133Ba, 139Ba, 140Ba, 141Ba, 142Ba, 143Ba, 144Ba, 145Ba, 146Ba, 147Ba, 148Ba, 149Ba, 150Ba, 151Ba, 152Ba, 153Ba