Prometij

61
Pm
Skupina
n/a
Perioda
6
Blok
f
Protons
Electrons
Neutrons
61
61
84
General Properties
Vrstno število
61
Atomska teža
[145]
Mass Number
145
Kategorija
Lantanoidi
Barva
Silver
Radioactive
Da
Named after the Greek Prometheus, who, according to mythology, stole fire from heaven
Kristalna struktura
n/a
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.
Electrons per shell
2, 8, 18, 23, 8, 2
Razporeditev elektronov
[Xe] 4f5 6s2
Pm
Promethium is the only lanthanide that has no stable isotopes
Physical Properties
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
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Pitchblende,
Zasluge za slike: 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
Atomic Properties
Atomski polmer
183 pm
Kovalentni polmer
199 pm
Elektronegativnost
-
Ionization Potential
5,582 eV
Atomic Volume
22,39 cm3/mol
Toplotna prevodnost
0,179 W/cm·K
Oksidacijska stanja
3
Applications
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
Isotopes
Stable Isotopes
-
Unstable Isotopes
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