Promethium (Pm)

General Properties

Symbol Pm
Atomic Number 61
Atomic Weight (145)
Group
(Lanthanoids)
Solid, Conductor, Lanthanide, Radioactive, Synthetic
Period 6
Block f

Physical Properties

Density 7.26 g/cm3
Atomic Volume 22.4 cm3/mole
Atomic Radius --
Covalent Radius --
Crust Abundance None
Crystal Structure Hexagonal
Color Silver

Energy

Electronegativity (Pauling Scale)
Electron Affinity 50 kJ/mol
1st Ionization Energy 540 kJ/mol
2nd Ionization Energy 1050 kJ/mol
3rd Ionization Energy 2150 kJ/mol
4th Ionization Energy 3970 kJ/mol
Specific Heat Capacity J g−1 K−1
Thermal Conductivity 17.9 W·m−1·K−1

Electrons & Oxidation

Oxidation States 3
Electrons Per Shell 2 8 18 23 8 2
Electron Configuration [Xe] 4f5 6s2
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f5 6s2
Orbital Diagram
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s
↿⇂
4p
↿⇂
↿⇂
↿⇂
4d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4f
↿ 
↿ 
↿ 
↿ 
↿ 
 
 
5s
↿⇂
5p
↿⇂
↿⇂
↿⇂
5d
 
 
 
 
 
5f
 
 
 
 
 
 
 
6s
↿⇂
6p
 
 
 
6d
 
 
 
 
 
6f
 
 
 
 
 
 
 

Nuclear

Radioactive Yes
Half Life 17.73 y
Lifetime 25.56y
Decay Electron Capture

Media

Planetary Bohr Model of Promethium (Pm)
Lewis Dot Diagram of Promethium (Pm)
Description
Rare earth metal of synthetic origin on the earth, naturally made in stars.
Uses
It has been used as a source of radioactivity for thickness-measuring gages.
Sources
Does not occur naturally. Found among fission products of uranium, thorium, and plutonium.
Pronounciation (English)
pro-MEE-thi-em

Translations

Afrikaans Promethium
Aragonese Prometio
العربية بروميثيوم
Armãneashte Prometiumu
asturianu Prometiu
azərbaycan dili Prometium
български Прометий
বাংলা প্রমিথিয়াম
brezhoneg Prometiom
bosanski Promethijum, ²Prometij
Byelorussian Праметый
Cebuano Prometyo
čeština Promethium
Chuvash Промети
Cymraeg Prometi
dansk Promethium
Deutsch Promethium
Ελληνικά Προμηθειο
English Promethium
esperanto Prometio
español Promécio
eesti Promeetium
euskara Prometioa
فارسی پرومتیم
suomi Prometium
føroyskt Promethium
français Prométhium
furlan Prometi
West-Frysk Promethium
Gaeilge Próméitiam
Gàidhlig Promèitiam
galego Prometio
ગુજરાતી પ્રોમીનિયમનો
Gaelg Promaiçhum
Hakka Chinese Ki (鉕)
עברית פרומתיום
हिन्दी प्रोमेथियम
hrvatski Prometij
magyar Promécium
հայերեն Պրոմեթիում
Indonesia Prometium
íslenska Prómetín, ²Prómeþín
italiano Promezio
日本語 プロメチウム
ქართული პრომეთიუმი
کٲشُر Promet
қазақ тілі Прометий
한국어 프로메튬
Kurdish Prometyûm
Komi Прометий
kernewek Promethyum
кыргызча Прометий
Latin Promethium
Lëtzebuergesch Promethium
Lombard Prumézzi
lingála Pometu
lietuvių Prometis
latviešu Prometijs
Mari Прометий
Maori Promethium
македонски Прометиум
മലയാളം പ്രൊമിതിയം
монгол Промети
Мокшан Промети
Bahasa Melayu Prometium
Malti Promizjum, ²Promezju
Nahuatl Prometio
Nederlands Promethium
norsk Promethium
Occitan Prometi
ирон Прометий
polski Promet
português Promécio
Runasimi Prometyu
română Promeţiu
русский Прометий
slovenčina Promethium
slovenščina Prometij
Samoan Prometimi
Samogitian Pruometis
shqip Promet, ²Promethiumi
српски Прометијум
Southern Sotho Promethiamo
svenska Prometium
Kiswahili Promethi
தமிழ் --
Tajik Прометий
ไทย โพรมีเทียม
Türkçe Prometyum
ئۇيغۇرچە جۈي
українська Прометій
o‘zbek Prometiy
Tiếng Việt Prometi
Võro Promeetium
中文

History

Discovered In
1945
Discovered By
J. A. Marinsky, Lawrence Glendenin, Charles D. Coryell
Discovered At
United States
Word Origin
Named after "Prometheus" in Greek mythology, who stole fire from the gods