パラジウム
46
Pd
族
10
周期
5
ブロック
d
陽子
電子
中性子
46
46
60
一般特性
原子番号
46
原子量
106.42
質量数
106
カテゴリ
遷移元素
色
銀色
放射性
いいえ
Palladium was named after the asteroid Pallas; Pallas was the Greek goddess of wisdom
結晶構造
面心立方格子
歴史
Palladium was discovered in 1803, in London, by English chemist William Hyde Wollaston.
He examined the residues left from platinum after dissolving it in aqua regia, a concentrated solution of hydrochloric and nitric acids.
He then isolated palladium in a series of chemical reactions.
He examined the residues left from platinum after dissolving it in aqua regia, a concentrated solution of hydrochloric and nitric acids.
He then isolated palladium in a series of chemical reactions.
電子殻
2, 8, 18, 18
電子配置
[Kr] 4d10
In the late 1800s, palladium was more expensive than platinum
物理特性
相
固体
密度
12.02 g/㎝3
融点
1828.05 K | 1554.9 °C | 2830.82 °F
沸点
3236.15 K | 2963 °C | 5365.4 °F
融解熱
16.7 kJ/mol
蒸発熱
380 kJ/mol
熱容量
0.244 J/g·K
地殻中における存在比
6.3×10-7%
宇宙空間における存在比
2×10-7%
CAS登録番号
7440-05-3
PubChem CID番号
23938
原子特性
原子半径
137 pm
共有結合半径
139 pm
電気陰性度
2.2 (ポーリングの値)
イオン化エネルギー
8.3369 eV
モル体積
8.9 ㎝3/mol
熱伝導率
0.718 W/㎝·K
酸化数
2, 4
用途
The largest use of palladium is in catalytic converters in the automobile industry.
Finely divided palladium is a good catalyst and is used for hydrogenation and dehydrogenation reactions.
The metal is used in dentistry, watch making, and in making surgical instruments and electrical contacts.
Finely divided palladium is a good catalyst and is used for hydrogenation and dehydrogenation reactions.
The metal is used in dentistry, watch making, and in making surgical instruments and electrical contacts.
Palladium is considered to be of low toxicity
同位体
安定同位体
102Pd, 104Pd, 105Pd, 106Pd, 108Pd, 110Pd不安定同位体
91Pd, 92Pd, 93Pd, 94Pd, 95Pd, 96Pd, 97Pd, 98Pd, 99Pd, 100Pd, 101Pd, 103Pd, 107Pd, 109Pd, 111Pd, 112Pd, 113Pd, 114Pd, 115Pd, 116Pd, 117Pd, 118Pd, 119Pd, 120Pd, 121Pd, 122Pd, 123Pd, 124Pd