ラジウム
88
Ra
族
2
周期
7
ブロック
s
陽子
電子
中性子
88
88
138
一般特性
原子番号
88
原子量
[226]
質量数
226
カテゴリ
アルカリ土類金属
色
銀色
放射性
はい
From the Latin word radius meaning ray
結晶構造
体心立方格子
歴史
Radium was discovered by Marie Curie and Pierre Curie in 1898.
They extracted the radium compound from a uraninite sample.
Radium was isolated in its metallic state by Marie Curie and André-Louis Debierne in 1910 through the electrolysis of radium chloride by using a mercury cathode and distilling in an atmosphere of hydrogen gas.
They extracted the radium compound from a uraninite sample.
Radium was isolated in its metallic state by Marie Curie and André-Louis Debierne in 1910 through the electrolysis of radium chloride by using a mercury cathode and distilling in an atmosphere of hydrogen gas.
電子殻
2, 8, 18, 32, 18, 8, 2
電子配置
[Rn] 7s2
Radium imparts a carmine red color to a flame
物理特性
相
固体
密度
5.5 g/㎝3
融点
973.15 K | 700 °C | 1292 °F
沸点
2010.15 K | 1737 °C | 3158.6 °F
融解熱
8 kJ/mol
蒸発熱
125 kJ/mol
熱容量
-
地殻中における存在比
9.9×10-12%
宇宙空間における存在比
該当なし
CAS登録番号
7440-14-4
PubChem CID番号
6328144
原子特性
原子半径
-
共有結合半径
221 pm
電気陰性度
0.9 (ポーリングの値)
イオン化エネルギー
5.2784 eV
モル体積
45.20 ㎝3/mol
熱伝導率
0.186 W/㎝·K
酸化数
2
用途
Radium was formerly used in self-luminous paints for watches, nuclear panels, aircraft switches, clocks, and instrument dials.
Radium chloride was used in medicine to produce radon gas which in turn was used as a cancer treatment.
The isotope 223Ra is currently under investigation for use in medicine as a cancer treatment of bone metastasis.
Radium chloride was used in medicine to produce radon gas which in turn was used as a cancer treatment.
The isotope 223Ra is currently under investigation for use in medicine as a cancer treatment of bone metastasis.
Radium is highly radioactive and carcinogenic
同位体
安定同位体
-不安定同位体
202Ra, 203Ra, 204Ra, 205Ra, 206Ra, 207Ra, 208Ra, 209Ra, 210Ra, 211Ra, 212Ra, 213Ra, 214Ra, 215Ra, 216Ra, 217Ra, 218Ra, 219Ra, 220Ra, 221Ra, 222Ra, 223Ra, 224Ra, 225Ra, 226Ra, 227Ra, 228Ra, 229Ra, 230Ra, 231Ra, 232Ra, 233Ra, 234Ra