ロジウム
45
Rh
族
9
周期
5
ブロック
d
陽子
電子
中性子
45
45
58
一般特性
原子番号
45
原子量
102.9055
質量数
103
カテゴリ
遷移元素
色
銀色
放射性
いいえ
From the Greek word rhodon, rose
結晶構造
面心立方格子
歴史
Rhodium was discovered in 1803 by William Hyde Wollaston in London.
He used crude platinum ore presumably obtained from South America.
The introduction of the three way catalytic converter by Volvo in 1976 increased the demand for rhodium.
He used crude platinum ore presumably obtained from South America.
The introduction of the three way catalytic converter by Volvo in 1976 increased the demand for rhodium.
電子殻
2, 8, 18, 16, 1
電子配置
[Kr] 4d8 5s1
Rhodium metal does not normally form an oxide, even when heated
物理特性
相
固体
密度
12.41 g/㎝3
融点
2237.15 K | 1964 °C | 3567.2 °F
沸点
3968.15 K | 3695 °C | 6683 °F
融解熱
21.7 kJ/mol
蒸発熱
495 kJ/mol
熱容量
0.243 J/g·K
地殻中における存在比
7×10-8%
宇宙空間における存在比
6×10-8%
CAS登録番号
7440-16-6
PubChem CID番号
23948
原子特性
原子半径
134 pm
共有結合半径
142 pm
電気陰性度
2.28 (ポーリングの値)
イオン化エネルギー
7.4589 eV
モル体積
8.3 ㎝3/mol
熱伝導率
1.5 W/㎝·K
酸化数
-1, 1, 2, 3, 4, 5, 6
用途
The element's major use is as one of the catalysts in the three-way catalytic converters in automobiles.
Rhodium is used as an alloying agent for hardening and improving the corrosion resistance of platinum and palladium.
It is also used as a filter in mammography systems because of the characteristic X-rays it produces.
Rhodium is also used for jewelry and for decorations.
Rhodium is used as an alloying agent for hardening and improving the corrosion resistance of platinum and palladium.
It is also used as a filter in mammography systems because of the characteristic X-rays it produces.
Rhodium is also used for jewelry and for decorations.
Rhodium is considered to be non-toxic
同位体
安定同位体
103Rh不安定同位体
89Rh, 90Rh, 91Rh, 92Rh, 93Rh, 94Rh, 95Rh, 96Rh, 97Rh, 98Rh, 99Rh, 100Rh, 101Rh, 102Rh, 104Rh, 105Rh, 106Rh, 107Rh, 108Rh, 109Rh, 110Rh, 111Rh, 112Rh, 113Rh, 114Rh, 115Rh, 116Rh, 117Rh, 118Rh, 119Rh, 120Rh, 121Rh, 122Rh