Prometij
61
Pm
Skupina
n/p
Perioda
6
Blok
f
Protoni
Elektroni
Nevtroni
61
61
84
Splošne lastnosti
Vrstno število
61
Atomska teža
[145]
Masno število
145
Kategorija
Lantanoidi
Barva
Srebrna
Radioaktivno
Da
Named after the Greek Prometheus, who, according to mythology, stole fire from heaven
Kristalna struktura
n/p
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 23, 8, 2
Razporeditev elektronov
[Xe] 4f5 6s2
Promethium is the only lanthanide that has no stable isotopes
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
7,26 g/cm3
Tališče
1315,15 K | 1042 °C | 1907,6 °F
Vrelišče
3273,15 K | 3000 °C | 5432 °F
Talilna toplota
7,7 kJ/mol
Izparilna toplota
290 kJ/mol
Toplotna kapaciteta
- J/g·K
Zastopanost v Zemljini skorji
n/p
Zastopanost v vesolju
n/p
Zasluge za slike: Wikimedia Commons (Geomartin)
Pitchblende, a uranium ore and the host for most of Earth's promethium
CAS številka
7440-12-2
PubChem CID številka
n/p
Atomske lastnosti
Atomski polmer
183 pm
Kovalentni polmer
199 pm
Elektronegativnost
-
Ionizacijski potencial
5,582 eV
Atomski volumen
22,39 cm3/mol
Toplotna prevodnost
0,179 W/cm·K
Oksidacijska stanja
3
Uporabe
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
Izotopi
Stabilni izotopi
-Nestabilni izotopi
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