Прометий
61
Pm
Група
Неизвестно
Период
6
Блок
f
Протони
Електрони
Неутрони
61
61
84
Главни свойства
Атомен номер
61
Атомна маса
[145]
Масов номер
145
Категория
Лантаниди
Цвят
Сребърен
Радиоактивни
Да
Named after the Greek Prometheus, who, according to mythology, stole fire from heaven
Кристална структура
Неизвестно
История
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.
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.
Електрон на обвивка
2, 8, 18, 23, 8, 2
Електронна конфигурация
[Xe] 4f5 6s2
Promethium is the only lanthanide that has no stable isotopes
Физични свойства
Фаза
Твърди
Плътност
7.26 g/cm3
Температура на топене
1315.15 K | 1042 °C | 1907.6 °F
Температура на кипене
3273.15 K | 3000 °C | 5432 °F
Топлина на сливането
7.7 kJ/mol
Топлина на изпаряване
290 kJ/mol
Специфичен топлинен капацитет
-
Изобилие в земната кора
Неизвестно
Изобилие в вселената
Неизвестно
Кредити за снимката: Wikimedia Commons (Geomartin)
Pitchblende, a uranium ore and the host for most of Earth's promethium
Номер на CAS
7440-12-2
Номер на PubChem CID
Неизвестно
Атомни свойства
Атомен радиус
183 pm
Ковалентен радиус
199 pm
Електроотрицателност
-
Йонизационен потенциал
5.582 eV
Моларен обем
22.39 cm3/mol
Топлопроводимост
0.179 W/cm·K
Оксидационни държави
3
Приложения
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 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
Изотопи
Стабилни изотопи
-Нестабилни изотопи
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