Prometij

61
Pm
Skupina
n/a
Perioda
6
Blok
f
Protoni
Elektroni
Neutroni
61
61
84
Opća svojstva
Atomski broj
61
Relativna atomska masa
[145]
Maseni broj
145
Kategorija
Lantanoidi
Boja
Srebrna
Radioaktivan
Da
Imenovan po grčkom Prometeju, koji je, u mitologiji, ukrao vatru od bogova
Kristalna struktura
n/a
Povijest
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.
Elektrona po ljusci
2, 8, 18, 23, 8, 2
Elektronska konfiguracija
[Xe] 4f5 6s2
Pm
Promethium is the only lanthanide that has no stable isotopes
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
7,26 g/cm3
Talište
1315,15 K | 1042 °C | 1907,6 °F
Vrelište
3273,15 K | 3000 °C | 5432 °F
Toplina taljenja
7,7 kJ/mol
Toplina isparavanja
290 kJ/mol
Specifični toplinski kapacitet
-
Zastupljenost u Zemljinoj kori
n/a
Zastupljenost u svemiru
n/a
Pitchblende,
Izvor slike: Wikimedia Commons (Geomartin)
Pitchblende, a uranium ore and the host for most of Earth's promethium
CAS broj
7440-12-2
PubChem CID broj
n/a
Atomska svojstva
Atomski radijus
183 pm
Kovalentni radijus
199 pm
Elektronegativnost
-
Potencijal ionizacije
5,582 eV
Atomski volumen
22,39 cm3/mol
Toplinska vodljivost
0,179 W/cm·K
Stanja oksidacije
3
Primjene
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
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