Прометијум

61
Pm
Група
n/a
Периода
6
Блок
f
Протони
Electrons
Неутрони
61
61
84
Општа својства
Атомски број
61
Атомска маса
[145]
Mass Number
145
Категорија
Лантаноиди
Боја
Сребрена
Радиоактиван
Да
Named after the Greek Prometheus, who, according to mythology, stole fire from heaven
Кристална структура
n/a
Историја
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.
Електрони по љусци
2, 8, 18, 23, 8, 2
Електронска конфигурација
[Xe] 4f5 6s2
Pm
Promethium is the only lanthanide that has no stable isotopes
Физичка својства
Стање
Чвсрто
Густина
7,26 g/cm3
Температура топљења
1315,15 K | 1042 °C | 1907,6 °F
Температура кључања
3273,15 K | 3000 °C | 5432 °F
Топлота топљења
7,7 kJ/mol
Топлота испаравања
290 kJ/mol
Специфична топлота
-
Заступљеност у Земљиној кори
n/a
Заступљеност у Космосу
n/a
Pitchblende,
Захвалности за слике: Wikimedia Commons (Geomartin)
Pitchblende, a uranium ore and the host for most of Earth's promethium
CAS Number
7440-12-2
PubChem CID Number
n/a
Атомска својства
Атомски радијус
183 pm
Ковалентни радијус
199 pm
Електронегативност
-
Јонизујући потенцијал
5,582 eV
Молска запремина
22,39 cm3/mol
Топлотна проводљивост
0,179 W/cm·K
Оксидациона стања
3
Примена
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
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