Prométium

61
Pm
Skupina
n/a
Perióda
6
Orbitál
f
Protóny
Elektróny
Neutróny
61
61
84
Hlavné vlastnosti
Protónové číslo
61
Atómová hmotnosť
[145]
Hmotnostné číslo
145
Kategória
Lantanoidy
Farba
Strieborná
Rádioaktívny
Áno
Named after the Greek Prometheus, who, according to mythology, stole fire from heaven
Kryštálová sústava
n/a
História
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.
Elektróny v obale
2, 8, 18, 23, 8, 2
Elektrónová konfigurácia
[Xe] 4f5 6s2
Pm
Promethium is the only lanthanide that has no stable isotopes
Fyzikálne vlastnosti
Skupenstvo
Tuhé látky
Hustota
7,26 g/cm3
Teplota topenia
1315,15 K | 1042 °C | 1907,6 °F
Teplota varu
3273,15 K | 3000 °C | 5432 °F
Skupenské teplo topenia
7,7 kJ/mol
Skupenské teplo varu
290 kJ/mol
Tepelná kapacita
-
Množstvo v zemskej kôre
n/a
Množstvo vo vesmíre
n/a
Pitchblende,
Zdroje obrázkov: Wikimedia Commons (Geomartin)
Pitchblende, a uranium ore and the host for most of Earth's promethium
Registračné číslo CAS
7440-12-2
PubChem CID Number
n/a
Atómové vlastnosti
Atómový polomer
183 pm
Kovalentný polomer
199 pm
Elektronegativita
-
Ionizačný potenciál
5,582 eV
Atómový objem
22,39 cm3/mol
Tepelná vodivosť
0,179 W/cm·K
Oxidačné stavy
3
Aplikácie
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
Izotopy
Stabilné izotopy
-
Nestabilné izotopy
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