59
Pr
無法計量
週期
6
f
個質子
電子
個中子
59
59
82
一般屬性
原子序數
59
標準原子質量
140.90765
品質編號
141
類別
鑭系元素
顏色
銀色
放射性
From the Greek word prasios, green, and didymos, twin
晶體結構
簡單六角形
歷史
Praseodymium was first identified in 1885, in Vienna, by the Austrian chemist Carl Auer von Welsbach.

It was discovered in didymium, a substance incorrectly said by Carl Gustav Mosander to be a new element in 1841.

Pure metallic praseodymium was first produced in 1931.
每個外殼的電子
2, 8, 18, 21, 8, 2
電子排布
[Xe] 4f3 6s2
Pr
Praseodymium is usually stored under a light mineral oil or sealed in glass
物理性質
物態
固體
密度
6.773 g/cm3
熔點
1208.15 K | 935 °C | 1715 °F
沸點
3793.15 K | 3520 °C | 6368 °F
熔化熱
6.9 kJ/mol
汽化熱
330 kJ/mol
比熱容
0.193 J/g·K
地殼豐度
0.00086%
宇宙豐度
2×10-7%
Ultrapure
圖片來源: Images-of-elements
Ultrapure praseodymium pieces under argon
CAS 編號
7440-10-0
Pubchem CID 編號
23942
原子性質
原子半徑
182 pm
共價半徑
203 pm
電負性
1.13 (鲍林标度)
電離電位
5.473 eV
原子體積
20.8 cm3/mol
熱導率
0.125 W/cm·K
氧化態
2, 3, 4
應用
Praseodymium is used as an alloying agent with magnesium to create high-strength metals that are used in aircraft engines.

Misch metal, used in making cigarette lighters, contains about 5% praseodymium metal.

Praseodymium is used to make specialized yellow glass goggles for glass blowers and welders.
Praseodymium is considered to be moderately toxic
同位素
穩定同位素
141Pr
不穩定同位素
121Pr, 122Pr, 123Pr, 124Pr, 125Pr, 126Pr, 127Pr, 128Pr, 129Pr, 130Pr, 131Pr, 132Pr, 133Pr, 134Pr, 135Pr, 136Pr, 137Pr, 138Pr, 139Pr, 140Pr, 142Pr, 143Pr, 144Pr, 145Pr, 146Pr, 147Pr, 148Pr, 149Pr, 150Pr, 151Pr, 152Pr, 153Pr, 154Pr, 155Pr, 156Pr, 157Pr, 158Pr, 159Pr