Prometi

61
Pm
Grup
n/a
Període
6
Bloc
f
Protons
Electrons
Neutrons
61
61
84
Propietats Generals
Nombre atòmic
61
Massa atòmica
[145]
Mass Number
145
Categoria
Lantànids
Color
Plata
Radioactiu
Named after the Greek Prometheus, who, according to mythology, stole fire from heaven
Estructura cristal·lina
n/a
Història
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.
Electrons per capa
2, 8, 18, 23, 8, 2
Configuració electrònica
[Xe] 4f5 6s2
Pm
Promethium is the only lanthanide that has no stable isotopes
Propietats Físiques
Fase
Sòlid
Densitat
7,26 g/cm3
Punt de fusió
1315,15 K | 1042 °C | 1907,6 °F
Punt d'ebullició
3273,15 K | 3000 °C | 5432 °F
Entalpia de fusió
7,7 kJ/mol
Entalpia de vaporització
290 kJ/mol
Capacitat tèrmica específica
-
Abundància a l'escorça terrestre
n/a
Abundància a l'univers
n/a
Pitchblende,
Crèdits de les imatges: 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
Propietats Atòmiques
Radi atòmic
183 pm
Radi covalent
199 pm
Electronegativitat
-
Potencial d'ionització
5,582 eV
Volum atòmic
22,39 cm3/mol
Conductivitat tèrmica
0,179 W/cm·K
Estats d'oxidació
3
Aplicacions
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
Isòtops
Isòtops estables
-
Isòtops inestables
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