45
Rh
9
週期
5
d
個質子
電子
個中子
45
45
58
一般屬性
原子序數
45
標準原子質量
102.9055
品質編號
103
類別
過渡金屬
顏色
銀色
放射性
From the Greek word rhodon, rose
晶體結構
面居中立方
歷史
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.
每個外殼的電子
2, 8, 18, 16, 1
電子排布
[Kr] 4d8 5s1
Rh
Rhodium metal does not normally form an oxide, even when heated
物理性質
物態
固體
密度
12.41 g/cm3
熔點
2237.15 K | 1964 °C | 3567.2 °F
沸點
3968.15 K | 3695 °C | 6683 °F
熔化熱
21.7 kJ/mol
汽化熱
495 kJ/mol
比熱容
0.243 J/g·K
地殼豐度
7×10-8%
宇宙豐度
6×10-8%
Rhodium
圖片來源: Wikimedia Commons (Alchemist-hp)
Rhodium powder
CAS 編號
7440-16-6
Pubchem CID 編號
23948
原子性質
原子半徑
134 pm
共價半徑
142 pm
電負性
2.28 (鲍林标度)
電離電位
7.4589 eV
原子體積
8.3 cm3/mol
熱導率
1.5 W/cm·K
氧化態
-1, 1, 2, 3, 4, 5, 6
應用
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 considered to be non-toxic
同位素
穩定同位素
103Rh
不穩定同位素
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