ランタン
57
La
族
該当なし
周期
6
ブロック
f
陽子
電子
中性子
57
57
82
一般特性
原子番号
57
原子量
138.90547
質量数
139
カテゴリ
ランタノイド
色
銀色
放射性
いいえ
From the Greek word lanthanein, to lie hidden
結晶構造
六方最密構造
歴史
Lanthanum was discovered in 1839 by Swedish chemist Carl Gustav Mosander.
He partially decomposed a sample of cerium nitrate by heating and treating the resulting salt with dilute nitric acid.
From the resulting solution, he obtained a pale brick colored oxide of the new rare earth.
Lanthanum was isolated in relatively pure form in 1923.
He partially decomposed a sample of cerium nitrate by heating and treating the resulting salt with dilute nitric acid.
From the resulting solution, he obtained a pale brick colored oxide of the new rare earth.
Lanthanum was isolated in relatively pure form in 1923.
電子殻
2, 8, 18, 18, 9, 2
電子配置
[Xe] 5d1 6s2
Lanthanum is the most reactive of the rare earth metals
物理特性
相
固体
密度
6.145 g/㎝3
融点
1193.15 K | 920 °C | 1688 °F
沸点
3737.15 K | 3464 °C | 6267.2 °F
融解熱
6.2 kJ/mol
蒸発熱
400 kJ/mol
熱容量
0.195 J/g·K
地殻中における存在比
0.0034%
宇宙空間における存在比
2×10-7%
CAS登録番号
7439-91-0
PubChem CID番号
23926
原子特性
原子半径
187 pm
共有結合半径
207 pm
電気陰性度
1.1 (ポーリングの値)
イオン化エネルギー
5.5769 eV
モル体積
22.5 ㎝3/mol
熱伝導率
0.135 W/㎝·K
酸化数
2, 3
用途
Lanthanum is used in large quantities in batteries for hybrid automobiles.
It is also used to make night vision goggles.
Small amounts of lanthanum, as an additive, can be used to produce nodular cast iron.
Lanthanum carbonate is used to reduce blood levels of phosphate in patients with kidney disease.
It is also used to make night vision goggles.
Small amounts of lanthanum, as an additive, can be used to produce nodular cast iron.
Lanthanum carbonate is used to reduce blood levels of phosphate in patients with kidney disease.
Lanthanum and its compounds are considered to be moderately toxic
同位体
安定同位体
139La不安定同位体
117La, 118La, 119La, 120La, 121La, 122La, 123La, 124La, 125La, 126La, 127La, 128La, 129La, 130La, 131La, 132La, 133La, 134La, 135La, 136La, 137La, 138La, 140La, 141La, 142La, 143La, 144La, 145La, 146La, 147La, 148La, 149La, 150La, 151La, 152La, 153La, 154La, 155La