61
Pm
無法計量
週期
6
f
個質子
電子
個中子
61
61
84
一般屬性
原子序數
61
標準原子質量
[145]
品質編號
145
類別
鑭系元素
顏色
銀色
放射性
Named after the Greek Prometheus, who, according to mythology, stole fire from heaven
晶體結構
無法計量
歷史
The existence of an element between neodymium and samarium was first predicted by Czech chemist Bohuslav Brauner in 1902.

Promethium was first produced and characterized at Oak Ridge National Laboratory in 1945 by Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell.

It was produced by the separation and analysis of the fission products of uranium fuel irradiated in a graphite reactor.
每個外殼的電子
2, 8, 18, 23, 8, 2
電子排布
[Xe] 4f5 6s2
Pm
Promethium is the only lanthanide that has no stable isotopes
物理性質
物態
固體
密度
7.26 g/cm3
熔點
1315.15 K | 1042 °C | 1907.6 °F
沸點
3273.15 K | 3000 °C | 5432 °F
熔化熱
7.7 kJ/mol
汽化熱
290 kJ/mol
比熱容
-
地殼豐度
無法計量
宇宙豐度
無法計量
Pitchblende,
圖片來源: Wikimedia Commons (Geomartin)
Pitchblende, a uranium ore and the host for most of Earth's promethium
CAS 編號
7440-12-2
Pubchem CID 編號
無法計量
原子性質
原子半徑
183 pm
共價半徑
199 pm
電負性
-
電離電位
5.582 eV
原子體積
22.39 cm3/mol
熱導率
0.179 W/cm·K
氧化態
3
應用
Promethium is also used in atomic batteries for spacecraft and guided missiles.

Promethium is also used to measure the thickness of materials by evaluating the amount of radiation from a promethium source that passes through the sample.

It has possible future uses in portable X-ray sources, and as auxiliary heat or power sources for space probes and satellites.
Promethium is harmful due to its radioactivity
同位素
穩定同位素
-
不穩定同位素
126Pm, 127Pm, 128Pm, 129Pm, 130Pm, 131Pm, 132Pm, 133Pm, 134Pm, 135Pm, 136Pm, 137Pm, 138Pm, 139Pm, 140Pm, 141Pm, 142Pm, 143Pm, 144Pm, 145Pm, 146Pm, 147Pm, 148Pm, 149Pm, 150Pm, 151Pm, 152Pm, 153Pm, 154Pm, 155Pm, 156Pm, 157Pm, 158Pm, 159Pm, 160Pm, 161Pm, 162Pm, 163Pm