Promethium

Promethium (Pm)

Promethium is the 61st element in the periodic table and has a symbol of Pm and atomic number of 61. It has an atomic weight of (144.91276) and a mass number of 126. Promethium has sixty-one protons and sixty-five neutrons in its nucleus, and sixty-one electrons in six shells. It is located in group Lanthanides, period six and block f of the periodic table. Soft silvery metallic element, belongs to the lanthanoids. Pm-147, the only natural isotope, is radioactive and has a half-life of 252 years. Eighteen radioisotopes have been produced, but all have very short half-lives. Found only in nuclear decay waste. Pm-147 is of interest as a beta-decay source, however Pm-146 and Pm-148 have to be removed from it first, as they generate gamma radiation. Discovered by J.A. Marinsky, L.E. Glendenin and C.D. Coryell in 1947.
Atomic Number61
Atomic Weight144.91276
Mass Number126
Group
Period6
Blockf
Protons61 p+
Neutrons65 n0
Electrons61 e-
Animated Bohr Model of Pm (Promethium)

Physical Properties

Atomic Radius
185 pm
Molar Volume
Covalent Radius
173 pm
Metallic Radius
Ionic Radius
97 pm
Crystal Radius
111 pm
Van der Waals Radius
238 pm
Density
7.26 g/cm³
Atomic Radii of the Elements: Promethium0102030405060708090100110120130140150160170180190200210220230240pmAtomic RadiusCovalent RadiusMetallic RadiusVan der Waals Radius

Chemical Properties

Energy
Proton Affinity
Electron Affinity
Ionization Energy
Ionization Energies of Pm (Promethium)
Heat of Vaporization
Heat of Fusion
Heat of Formation
Electrons
Electron Shells2, 8, 18, 23, 8, 2
Bohr Model: Pm (Promethium)
Valence Electrons2
Lewis Structure: Pm (Promethium)
Electron Configuration[Xe] 4f5 6s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 4f5 6s2
Enhanced Bohr Model of Pm (Promethium)
Orbital Diagram of Pm (Promethium)
Oxidation States2, 3
Electronegativity
Electrophilicity Index
States of Matter
PhaseSolid
Gas Phase
Boiling Point
Melting Point
1,315.15 K
Critical Pressure
Critical Temperature
Triple Point
Visual

Promethium is a Silver. Pm has a CPK of #ff1493, Jmol of #a3ffc7, and MOLCAS GV of #a3ffc7. The Appearance of Element 61 is metallic.

Color
Silver
Appearancemetallic
Refractive Index
Thermodynamic Properties
Thermal Conductivity
17.9 W/(m K)
Thermal Expansion
0.000011 1/K
Molar Heat Capacity
Specific Heat Capacity
Heat Capacity Ratio (Adiabatic Index)
Electrical Properties
TypeConductor
Electrical Conductivity
1.3 MS/m
Electrical Resistivity
0.00000075 m Ω
Superconducting Point
Magnetism
Type
Magnetic Susceptibility (Mass)
Magnetic Susceptibility (Molar)
Magnetic Susceptibility (Volume)
Magnetic Ordering
Curie Point
Neel Point
Structure

The lattice angles of Promethium is .

Crystal Structure ()
Lattice Constant
Lattice Angles
Mechanical Properties

The Bulk Modulus of Promethium is 33 GPa. The Shear Modulus of Pm is 18 GPa. The Young Modulus of Element 61 is 46 GPa. The Poisson Ratio of Promethium (Pm) is 0.28.

Hardness
Bulk Modulus
33 GPa
Shear Modulus
18 GPa
Young's Modulus
46 GPa
Poisson Ratio
0.28
Speed of Sound
Classification

The Glawe Number of Promethium is 28. The Mendeleev Number of Pm is 21. The Pettifor Number of Element 61 is 29. The Geochemical Class of Promethium (Pm) is rare earth & related. The Goldschmidt Class of Promethium is litophile.

CategoryLanthanides, Lanthanides
CAS Group
IUPAC Group
Glawe Number28
Mendeleev Number21
Pettifor Number29
Geochemical Classrare earth & related
Goldschmidt Classlitophile

Other

The Dipole Polarizability of Promethium is 200 plus or minus 20 a₀. Pm has a C6 Dispersion Coefficient (GB) of 3340 a₀. The Allotropes of Element 61 is . The Neutron Cross Section of Promethium (Pm) is 8400. The Quantum Numbers of Promethium is 6H5/2. The Space Group of Pm is ().

Gas Basicity
Dipole Polarizability
200 ± 20 a₀
C6 Dispersion Coefficient
Allotropes
Neutron Cross Section
8,400
Neutron Mass Absorption
Quantum Numbers6H5/2
Space Group ()

Isotopes of Promethium

Stable Isotopes0
Unstable Isotopes40
Natural Isotopes0

126Pm

Mass Number126
Neutron Number65
Relative Atomic Mass
125.957327 ± 0.000537 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year
Parity

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)
β+ p (β+-delayed proton emission)

127Pm

Mass Number127
Neutron Number66
Relative Atomic Mass
126.951358 ± 0.000429 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
Spin3/2
Quadrupole Moment
Discovery Year
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)
p (proton emission)

128Pm

Mass Number128
Neutron Number67
Relative Atomic Mass
127.948234 ± 0.000322 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
1 ± 0.3 s
Spin4
Quadrupole Moment
Discovery Year1999
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)
p (proton emission)0%

129Pm

Mass Number129
Neutron Number68
Relative Atomic Mass
128.942909 ± 0.000322 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
2.4 ± 0.9 s
Spin5/2
Quadrupole Moment
Discovery Year2004
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)
p (proton emission)

130Pm

Mass Number130
Neutron Number69
Relative Atomic Mass
129.940451 ± 0.000215 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
2.6 ± 0.2 s
Spin5
Quadrupole Moment
Discovery Year1985
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)

131Pm

Mass Number131
Neutron Number70
Relative Atomic Mass
130.935834 ± 0.000215 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
6.3 ± 0.8 s
Spin11/2
Quadrupole Moment
Discovery Year1998
Parity-

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%

132Pm

Mass Number132
Neutron Number71
Relative Atomic Mass
131.93384 ± 0.00016 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
6.2 ± 0.6 s
Spin3
Quadrupole Moment
Discovery Year1977
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%
β+ p (β+-delayed proton emission)5%

133Pm

Mass Number133
Neutron Number72
Relative Atomic Mass
132.929782 ± 0.000054 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
13.5 ± 2.1 s
Spin3/2
Quadrupole Moment
Discovery Year1977
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%

134Pm

Mass Number134
Neutron Number73
Relative Atomic Mass
133.928326 ± 0.000045 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
22 ± 1 s
Spin5
Quadrupole Moment
Discovery Year1977
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%

135Pm

Mass Number135
Neutron Number74
Relative Atomic Mass
134.924785 ± 0.000089 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
49 ± 3 s
Spin3/2
Quadrupole Moment
Discovery Year1975
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%

136Pm

Mass Number136
Neutron Number75
Relative Atomic Mass
135.923595949 ± 0.000074152 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
107 ± 6 s
Spin7
Quadrupole Moment
Discovery Year1988
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%

137Pm

Mass Number137
Neutron Number76
Relative Atomic Mass
136.920479519 ± 0.000014 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
Spin5/2
Quadrupole Moment
Discovery Year1975
Parity-

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)

138Pm

Mass Number138
Neutron Number77
Relative Atomic Mass
137.919576119 ± 0.000012456 Da
G-Factor
1.0666666666667 ± 0.3
Abundance
Radioactivity☢️ Radioactive
Half Life
3.24 ± 0.05 m
Spin3
Quadrupole Moment
Discovery Year1973
Parity-

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%

139Pm

Mass Number139
Neutron Number78
Relative Atomic Mass
138.916799228 ± 0.000014587 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
4.15 ± 0.05 m
Spin5/2
Quadrupole Moment
Discovery Year1967
Parity

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%

140Pm

Mass Number140
Neutron Number79
Relative Atomic Mass
139.916035918 ± 0.000026001 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
9.2 ± 0.2 s
Spin1
Quadrupole Moment
Discovery Year1966
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%

141Pm

Mass Number141
Neutron Number80
Relative Atomic Mass
140.913555081 ± 0.000015 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
20.9 ± 0.05 m
Spin5/2
Quadrupole Moment
Discovery Year1952
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%

142Pm

Mass Number142
Neutron Number81
Relative Atomic Mass
141.912890982 ± 0.00002533 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
40.5 ± 0.5 s
Spin1
Quadrupole Moment
Discovery Year1959
Parity+

Decay ModeIntensity
β+ (β+ decay; β+ = ϵ + e+)100%
e+ (positron emission)77.1%
ϵ (electron capture)22.9%

143Pm

Mass Number143
Neutron Number82
Relative Atomic Mass
142.910938068 ± 0.00000316 Da
G-Factor
1.52 ± 0.2
Abundance
Radioactivity☢️ Radioactive
Half Life
265 ± 7 d
Spin5/2
Quadrupole Moment
Discovery Year1952
Parity+

Decay ModeIntensity
ϵ (electron capture)100%
e+ (positron emission)5.7%

144Pm

Mass Number144
Neutron Number83
Relative Atomic Mass
143.912596208 ± 0.000003126 Da
G-Factor
0.338 ± 0.028
Abundance
Radioactivity☢️ Radioactive
Half Life
363 ± 14 d
Spin5
Quadrupole Moment
Discovery Year1952
Parity-

Decay ModeIntensity
ϵ (electron capture)100%
e+ (positron emission)8%

145Pm

Mass Number145
Neutron Number84
Relative Atomic Mass
144.912755748 ± 0.000003011 Da
G-Factor
1.52 ± 0.064
Abundance
Radioactivity☢️ Radioactive
Half Life
17.7 ± 0.4 y
Spin5/2
Quadrupole Moment
0.23 ± 0.08
Discovery Year1951
Parity+

Decay ModeIntensity
ϵ (electron capture)100%
α (α emission)2.8%

146Pm

Mass Number146
Neutron Number85
Relative Atomic Mass
145.91470224 ± 0.000004589 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
5.53 ± 0.05 y
Spin3
Quadrupole Moment
Discovery Year1960
Parity-

Decay ModeIntensity
ϵ (electron capture)66%
β (β decay)34%

147Pm

Mass Number147
Neutron Number86
Relative Atomic Mass
146.915144944 ± 0.000001382 Da
G-Factor
0.73714285714286 ± 0.02
Abundance
Radioactivity☢️ Radioactive
Half Life
2.6234 ± 0.0002 y
Spin7/2
Quadrupole Moment
0.74 ± 0.2
Discovery Year1947
Parity+

Decay ModeIntensity
β (β decay)100%

148Pm

Mass Number148
Neutron Number87
Relative Atomic Mass
147.917481091 ± 0.000006108 Da
G-Factor
2.1 ± 0.2
Abundance
Radioactivity☢️ Radioactive
Half Life
5.368 ± 0.007 d
Spin1
Quadrupole Moment
0.2 ± 0.2
Discovery Year1947
Parity-

Decay ModeIntensity
β (β decay)100%

149Pm

Mass Number149
Neutron Number88
Relative Atomic Mass
148.918341507 ± 0.000002344 Da
G-Factor
0.94285714285714 ± 0.14285714285714
Abundance
Radioactivity☢️ Radioactive
Half Life
53.08 ± 0.05 h
Spin7/2
Quadrupole Moment
Discovery Year1947
Parity+

Decay ModeIntensity
β (β decay)100%

150Pm

Mass Number150
Neutron Number89
Relative Atomic Mass
149.920990014 ± 0.000021504 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
2.698 ± 0.015 h
Spin1
Quadrupole Moment
Discovery Year1952
Parity-

Decay ModeIntensity
β (β decay)100%

151Pm

Mass Number151
Neutron Number90
Relative Atomic Mass
150.921216613 ± 0.000004949 Da
G-Factor
0.72 ± 0.08
Abundance
Radioactivity☢️ Radioactive
Half Life
28.4 ± 0.04 h
Spin5/2
Quadrupole Moment
2.2 ± 0.9
Discovery Year1952
Parity+

Decay ModeIntensity
β (β decay)100%

152Pm

Mass Number152
Neutron Number91
Relative Atomic Mass
151.923505185 ± 0.000027809 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
4.12 ± 0.08 m
Spin1
Quadrupole Moment
Discovery Year1958
Parity+

Decay ModeIntensity
β (β decay)100%

153Pm

Mass Number153
Neutron Number92
Relative Atomic Mass
152.924156252 ± 0.000009729 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
5.25 ± 0.02 m
Spin5/2
Quadrupole Moment
Discovery Year1962
Parity-

Decay ModeIntensity
β (β decay)100%

154Pm

Mass Number154
Neutron Number93
Relative Atomic Mass
153.926712791 ± 0.000026861 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
2.68 ± 0.07 m
Spin4
Quadrupole Moment
Discovery Year1958
Parity+

Decay ModeIntensity
β (β decay)100%

155Pm

Mass Number155
Neutron Number94
Relative Atomic Mass
154.928136951 ± 0.000005065 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
41.5 ± 0.2 s
Spin5/2
Quadrupole Moment
Discovery Year1982
Parity-

Decay ModeIntensity
β (β decay)100%

156Pm

Mass Number156
Neutron Number95
Relative Atomic Mass
155.931114059 ± 0.000001275 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
27.4 ± 0.5 s
Spin4
Quadrupole Moment
Discovery Year1986
Parity+

Decay ModeIntensity
β (β decay)100%

157Pm

Mass Number157
Neutron Number96
Relative Atomic Mass
156.933121298 ± 0.000007521 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
10.56 ± 0.1 s
Spin5/2
Quadrupole Moment
Discovery Year1987
Parity-

Decay ModeIntensity
β (β decay)100%

158Pm

Mass Number158
Neutron Number97
Relative Atomic Mass
157.936546948 ± 0.000000953 Da
G-Factor
0
Abundance
Radioactivity☢️ Radioactive
Half Life
4.8 ± 0.5 s
Spin0
Quadrupole Moment
0
Discovery Year1987
Parity+

Decay ModeIntensity
β (β decay)100%

159Pm

Mass Number159
Neutron Number98
Relative Atomic Mass
158.939286409 ± 0.000010777 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
1.49 ± 0.13 s
Spin5/2
Quadrupole Moment
Discovery Year1998
Parity-

Decay ModeIntensity
β (β decay)100%

160Pm

Mass Number160
Neutron Number99
Relative Atomic Mass
159.943215272 ± 0.0000022 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
725 ± 57 ms
Spin6
Quadrupole Moment
Discovery Year2012
Parity-

Decay ModeIntensity
β (β decay)100%
β n (β-delayed neutron emission)

161Pm

Mass Number161
Neutron Number100
Relative Atomic Mass
160.946229837 ± 0.0000097 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
1.05 ± 0.15 s
Spin5/2
Quadrupole Moment
Discovery Year2012
Parity-

Decay ModeIntensity
β (β decay)100%
β n (β-delayed neutron emission)

162Pm

Mass Number162
Neutron Number101
Relative Atomic Mass
161.950574 ± 0.000322 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
630 ± 180 ms
Spin2
Quadrupole Moment
Discovery Year2012
Parity+

Decay ModeIntensity
β (β decay)100%
β n (β-delayed neutron emission)

163Pm

Mass Number163
Neutron Number102
Relative Atomic Mass
162.953881 ± 0.000429 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
255 ± 25 ms
Spin5/2
Quadrupole Moment
Discovery Year2012
Parity-

Decay ModeIntensity
β (β decay)100%
β n (β-delayed neutron emission)

164Pm

Mass Number164
Neutron Number103
Relative Atomic Mass
163.958819 ± 0.000429 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
Spin5
Quadrupole Moment
Discovery Year2018
Parity-

Decay ModeIntensity
β (β decay)
β n (β-delayed neutron emission)

165Pm

Mass Number165
Neutron Number104
Relative Atomic Mass
164.96278 ± 0.000537 Da
G-Factor
Abundance
Radioactivity☢️ Radioactive
Half Life
Spin5/2
Quadrupole Moment
Discovery Year2018
Parity-

Decay ModeIntensity
β (β decay)
β n (β-delayed neutron emission)
Promethium
Promethium spectrum visible

History

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. Named after the Greek Prometheus, who, according to mythology, stole fire from heaven

DiscoverersJ.A. Marinsky, L.E. Glendenin, C.D. Coryell
Discovery LocationUnited States
Discovery Year1945
Etymology (Name Origin)Named for the Greek god, Prometheus.
Pronunciationpro-MEE-thi-em (English)
Promethium is harmful due to its radioactivity
Promethium is the only lanthanide that has no stable isotopes

Uses

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. 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.

Abundance
Abundance in Earth's crust
Natural Abundance (Oceans)
Natural Abundance (Human Body)
0 %
Natural Abundance (Meteor)
0 %
Natural Abundance (Sun)
0 %
Abundance in Universe
0 %

Nuclear Screening Constants

1s1.2042
2p4.2562
2s16.0296
3d13.9018
3p19.4461
3s19.8154
4d33.26
4f37.866
4p30.3768
4s29.3604
5p44.586
5s42.1645
6s51.6046

Also Known As

  • Pm
  • element 61
  • 61Pm

Translations

  • Frenchprométhium
  • Italianpromezio
  • Spanishprometio
  • GermanPromethium
  • Amharicፕሮሜቲየም
  • Arabicبروميثيوم
  • AzerbaijaniPrometium
  • BelarusianПраметый
  • Bulgarianпрометий
  • Banglaপ্রমিথিয়াম
  • Bosnianprometij
  • Catalanprometi
  • CorsicanPromeziu
  • Czechpromethium
  • ChuvashПромети
  • WelshPromethiwm
  • Danishpromethium
  • Greekπρομήθειο
  • Esperantoprometio
  • EstonianPromeetium
  • Basqueprometio
  • Persianپرومتیم
  • Finnishprometium
  • FriulianPrometi
  • Irishpróiméitiam
  • GalicianPromecio
  • ManxPromaiçhum
  • Hakka Chinesepromethium
  • Hebrewפרומתיום
  • Hindiप्रोमीथियम
  • Fiji HindiPromethium
  • CroatianPrometij
  • Hungarianprométium
  • Armenianպրոմեթիում
  • Interlinguapromethium
  • Indonesianprometium
  • Idoprometio
  • Japaneseプロメチウム
  • Lojbanfagycevjinme
  • JavanesePrometium
  • Georgianპრომეთიუმი
  • Kannadaಪ್ರೊಮೆಥಿಯಮ್
  • Korean프로메튬
  • KomiПрометий
  • Latinpromethium
  • LuxembourgishPromethium
  • LigurianPromesio
  • LithuanianPrometis
  • Latvianprometijs
  • Malayalamപ്രൊമിതിയം
  • Marathiप्रोमेथियम
  • Western MariПрометий
  • MalayPrometium
  • Burmeseပရိုမီသီယမ်
  • Dutchpromethium
  • Norwegian Nynorskpromethium
  • Polishpromet
  • Western Panjabiپرومتھیم
  • Portuguesepromécio
  • QuechuaPrometyu
  • Romanianpromețiu
  • Russianпрометий
  • YakutПрометиум
  • Sicilianprumezziu
  • Serbo-CroatianPrometijum
  • Slovakprométium
  • SlovenianPrometij
  • Serbianпрометијум
  • Saterland FrisianPromethium
  • Swedishprometium
  • Tamilபுரோமித்தியம்
  • Thaiโพรมีเทียม
  • TurkishPrometyum
  • Uyghurجۈي
  • Ukrainianпрометій
  • UrduPromethium
  • VepsPrometii
  • Vietnamesepromethi
  • WarayPrometyo
  • KalmykПрометиүм
  • YorubaPromethium
  • Chinese
  • Norwegian Bokmålpromethium
  • BretonPrometiom
  • CebuanoPrometyo
  • Macedonianпрометиум
  • Central Kurdishپرۆمیتیۆم
  • Gujaratiપ્રોમેથિયમ
  • TagalogPrometyo
  • Odiaପ୍ରୋମେଥିଅମ
  • PiedmontesePromessi
  • TatarПрометий
  • Cantonese
  • Belarusian (Taraskievica orthography)Прамэт
  • AlbanianPrometiumi
  • UzbekPrometiy
  • Newariप्रोमेथियम
  • AromanianPromețiu
  • KyrgyzПрометий
  • Sanskritप्रोमेथियम
  • Malteseprometju
  • LimburgishPromethium
  • Scottish GaelicPrometium
  • Portuguese (Brazil)promécio
  • Nepaliप्रोमेथियम
  • Paliप्रोमेथियम
  • Teluguప్రోమిథియం
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