セリウム
58
Ce
族
該当なし
周期
6
ブロック
f
陽子
電子
中性子
58
58
82
一般特性
原子番号
58
原子量
140.116
質量数
140
カテゴリ
ランタノイド
色
銀色
放射性
いいえ
Cerium was named for the asteroid Ceres
結晶構造
六方最密構造
歴史
Jöns Jakob Berzelius and Wilhelm Hisinger discovered the element in ceria in 1803 in Sweden.
Klaproth discovered it simultaneously and independently in some tantalum samples in Germany.
Carl Gustaf Mosander, who worked closely with Berzelius, prepared metallic cerium in 1825.
Klaproth discovered it simultaneously and independently in some tantalum samples in Germany.
Carl Gustaf Mosander, who worked closely with Berzelius, prepared metallic cerium in 1825.
電子殻
2, 8, 18, 19, 9, 2
電子配置
[Xe] 4f1 5d1 6s2
Seawater contains 1.5 parts per trillion of cerium
物理特性
相
固体
密度
6.77 g/㎝3
融点
1068.15 K | 795 °C | 1463 °F
沸点
3716.15 K | 3443 °C | 6229.4 °F
融解熱
5.5 kJ/mol
蒸発熱
350 kJ/mol
熱容量
0.192 J/g·K
地殻中における存在比
0.006%
宇宙空間における存在比
1×10-6%
CAS登録番号
7440-45-1
PubChem CID番号
23974
原子特性
原子半径
182 pm
共有結合半径
204 pm
電気陰性度
1.12 (ポーリングの値)
イオン化エネルギー
5.5387 eV
モル体積
20.67 ㎝3/mol
熱伝導率
0.114 W/㎝·K
酸化数
2, 3, 4
用途
Cerium is used in carbon-arc lighting, especially in the motion picture industry.
Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps.
Cerium compounds are also used in the manufacture of glass, both as a component and as a decolorizer.
Cerium oxide is an important component of glass polishing powders and phosphors used in screens and fluorescent lamps.
Cerium compounds are also used in the manufacture of glass, both as a component and as a decolorizer.
Cerium is considered to be moderately toxic
同位体
安定同位体
136Ce, 138Ce, 140Ce, 142Ce不安定同位体
119Ce, 120Ce, 121Ce, 122Ce, 123Ce, 124Ce, 125Ce, 126Ce, 127Ce, 128Ce, 129Ce, 130Ce, 131Ce, 132Ce, 133Ce, 134Ce, 135Ce, 137Ce, 139Ce, 141Ce, 143Ce, 144Ce, 145Ce, 146Ce, 147Ce, 148Ce, 149Ce, 150Ce, 151Ce, 152Ce, 153Ce, 154Ce, 155Ce, 156Ce, 157Ce