Promethyum (Pm)

chemical element with the atomic number of 61

Atomic Number	61
Atomic Weight	144.91276
mass number	126

Group
Period	6
Block	f

proton	61 p⁺
neutron	65 n⁰
electron	61 e^-

Physical Property

Atomic Radius	185 pm 283 pm
molar volume
covalent radius	173 pm 135 pm 199 pm
Metallic Radius
ionic radius	97 pm 109.3 pm 114.4 pm
Crystal Radius	111 pm 123.3 pm 128.4 pm
Van der Waals radius	238 pm 272 pm 354.7 pm
dosedh	7.26 g/cm³

Chemical Property

nerth

proton affinity
electron affinity
ionization energy	5.582 eV/particle 10.9 eV/particle 22 eV/particle 41 eV/particle 61.69 eV/particle 85 eV/particle 101 eV/particle 116 eV/particle 138 eV/particle 155 eV/particle 174 eV/particle 202 eV/particle 229 eV/particle 200 eV/particle 269 eV/particle 430 eV/particle 462 eV/particle 497 eV/particle 534 eV/particle 569 eV/particle 609 eV/particle 651 eV/particle 689 eV/particle 730 eV/particle 767 eV/particle 916 eV/particle 956 eV/particle 998 eV/particle 1,040 eV/particle 1,113 eV/particle 1,158 eV/particle 1,261 eV/particle 1,308.7 eV/particle 2,251 eV/particle 2,344 eV/particle 2,443 eV/particle 2,549 eV/particle 2,652 eV/particle 2,755 eV/particle 2,892 eV/particle 2,997 eV/particle 3,110 eV/particle 3,219 eV/particle 3,519 eV/particle 3,613 eV/particle 3,718 eV/particle 3,816 eV/particle 4,056 eV/particle 4,166 eV/particle 4,371 eV/particle 4,476 eV/particle 10,115 eV/particle 10,378 eV/particle 10,671 eV/particle 10,942 eV/particle 11,819 eV/particle 12,136 eV/particle 12,532 eV/particle 12,797.26 eV/particle 52,144.29 eV/particle 53,346.1 eV/particle

enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation
electron

electron shell	2, 8, 18, 23, 8, 2

valence electron	2 ⓘ

aray an elektrons	[Xe] 4f⁵ 6s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f⁵ 6s²

oxidation number	2, 3
electronegativity	0.1810032
Electrophilicity Index
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point
Melting Point	1,315.15 K
critical pressure
critical temperature
triple point
appearance
liw	Silver #ff1493 #a3ffc7 #a3ffc7
appearance	metallic
refractive index
thermodynamic material property
Thermal Conductivity	17.9 W/(m K)
thermal expansion	0.000011 1/K
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	1.3 MS/m
electrical resistivity	0.00000075 Ω*m
superconductivity
magnetism
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
kesweyth
Crystal Structure	()
lattice constant
Lattice Angles
mechanical property
hardness
bulk modulus	33 GPa
shear modulus	18 GPa
Young's modulus	46 GPa
Poisson's ratio	0.28
speed of sound
classification
Category	Lanthanides, Lanthanides
CAS Group
IUPAC Group
Glawe Number	28
Mendeleev Number	21
Pettifor Number	29
Geochemical Class	rare earth & related
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	200 ± 20 a₀
C6 Dispersion Coefficient	3,340 a₀
allotrope
Neutron cross section	8,400
Neutron Mass Absorption
quantum number	6H5/2
space group	()

Isotopes of Promethium

Stable Isotopes	0
Unstable Isotopes	40
Natural Isotopes	0

¹²⁶Pm

mass number	126
neutron number	65
relative atomic mass	125.957327 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin
nuclear quadrupole moment
dydhyas diskudhans
parity

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
β⁺ p (β⁺-delayed proton emission)

¹²⁷Pm

mass number	127
neutron number	66
relative atomic mass	126.951358 ± 0.000429 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
p (proton emission)

¹²⁸Pm

mass number	128
neutron number	67
relative atomic mass	127.948234 ± 0.000322 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	1 ± 0.3 s
spin	4
nuclear quadrupole moment
dydhyas diskudhans	1999
parity	+

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

¹²⁹Pm

mass number	129
neutron number	68
relative atomic mass	128.942909 ± 0.000322 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	2.4 ± 0.9 s
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	2004
parity	+

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

¹³⁰Pm

mass number	130
neutron number	69
relative atomic mass	129.940451 ± 0.000215 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	2.6 ± 0.2 s
spin	5
nuclear quadrupole moment
dydhyas diskudhans	1985
parity	+

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

¹³¹Pm

mass number	131
neutron number	70
relative atomic mass	130.935834 ± 0.000215 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	6.3 ± 0.8 s
spin	11/2
nuclear quadrupole moment
dydhyas diskudhans	1998
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹³²Pm

mass number	132
neutron number	71
relative atomic mass	131.93384 ± 0.00016 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	6.2 ± 0.6 s
spin	3
nuclear quadrupole moment
dydhyas diskudhans	1977
parity	+

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

¹³³Pm

mass number	133
neutron number	72
relative atomic mass	132.929782 ± 0.000054 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	13.5 ± 2.1 s
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	1977
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹³⁴Pm

mass number	134
neutron number	73
relative atomic mass	133.928326 ± 0.000045 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	22 ± 1 s
spin	5
nuclear quadrupole moment
dydhyas diskudhans	1977
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹³⁵Pm

mass number	135
neutron number	74
relative atomic mass	134.924785 ± 0.000089 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	49 ± 3 s
spin	3/2
nuclear quadrupole moment
dydhyas diskudhans	1975
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹³⁶Pm

mass number	136
neutron number	75
relative atomic mass	135.923595949 ± 0.000074152 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	107 ± 6 s
spin	7
nuclear quadrupole moment
dydhyas diskudhans	1988
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹³⁷Pm

mass number	137
neutron number	76
relative atomic mass	136.920479519 ± 0.000014 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1975
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

¹³⁸Pm

mass number	138
neutron number	77
relative atomic mass	137.919576119 ± 0.000012456 Da
g-factor	1.0666666666667 ± 0.3
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	3.24 ± 0.05 m
spin	3
nuclear quadrupole moment
dydhyas diskudhans	1973
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹³⁹Pm

mass number	139
neutron number	78
relative atomic mass	138.916799228 ± 0.000014587 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	4.15 ± 0.05 m
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1967
parity

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁴⁰Pm

mass number	140
neutron number	79
relative atomic mass	139.916035918 ± 0.000026001 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	9.2 ± 0.2 s
spin	1
nuclear quadrupole moment
dydhyas diskudhans	1966
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁴¹Pm

mass number	141
neutron number	80
relative atomic mass	140.913555081 ± 0.000015 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	20.9 ± 0.05 m
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1952
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

¹⁴²Pm

mass number	142
neutron number	81
relative atomic mass	141.912890982 ± 0.00002533 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	40.5 ± 0.5 s
spin	1
nuclear quadrupole moment
dydhyas diskudhans	1959
parity	+

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

¹⁴³Pm

mass number	143
neutron number	82
relative atomic mass	142.910938068 ± 0.00000316 Da
g-factor	1.52 ± 0.2
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	265 ± 7 d
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1952
parity	+

decay mode	intensity
ϵ (electron capture)	100%
e⁺ (positron emission)	5.7%

¹⁴⁴Pm

mass number	144
neutron number	83
relative atomic mass	143.912596208 ± 0.000003126 Da
g-factor	0.338 ± 0.028
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	363 ± 14 d
spin	5
nuclear quadrupole moment
dydhyas diskudhans	1952
parity	-

decay mode	intensity
ϵ (electron capture)	100%
e⁺ (positron emission)	8%

¹⁴⁵Pm

mass number	145
neutron number	84
relative atomic mass	144.912755748 ± 0.000003011 Da
g-factor	1.52 ± 0.064
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	17.7 ± 0.4 y
spin	5/2
nuclear quadrupole moment	0.23 ± 0.08
dydhyas diskudhans	1951
parity	+

decay mode	intensity
ϵ (electron capture)	100%
α (α emission)	2.8%

¹⁴⁶Pm

mass number	146
neutron number	85
relative atomic mass	145.91470224 ± 0.000004589 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	5.53 ± 0.05 y
spin	3
nuclear quadrupole moment
dydhyas diskudhans	1960
parity	-

decay mode	intensity
ϵ (electron capture)	66%
β⁻ (β⁻ decay)	34%

¹⁴⁷Pm

mass number	147
neutron number	86
relative atomic mass	146.915144944 ± 0.000001382 Da
g-factor	0.73714285714286 ± 0.02
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	2.6234 ± 0.0002 y
spin	7/2
nuclear quadrupole moment	0.74 ± 0.2
dydhyas diskudhans	1947
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁴⁸Pm

mass number	148
neutron number	87
relative atomic mass	147.917481091 ± 0.000006108 Da
g-factor	2.1 ± 0.2
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	5.368 ± 0.007 d
spin	1
nuclear quadrupole moment	0.2 ± 0.2
dydhyas diskudhans	1947
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁴⁹Pm

mass number	149
neutron number	88
relative atomic mass	148.918341507 ± 0.000002344 Da
g-factor	0.94285714285714 ± 0.14285714285714
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	53.08 ± 0.05 h
spin	7/2
nuclear quadrupole moment
dydhyas diskudhans	1947
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵⁰Pm

mass number	150
neutron number	89
relative atomic mass	149.920990014 ± 0.000021504 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	2.698 ± 0.015 h
spin	1
nuclear quadrupole moment
dydhyas diskudhans	1952
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵¹Pm

mass number	151
neutron number	90
relative atomic mass	150.921216613 ± 0.000004949 Da
g-factor	0.72 ± 0.08
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	28.4 ± 0.04 h
spin	5/2
nuclear quadrupole moment	2.2 ± 0.9
dydhyas diskudhans	1952
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵²Pm

mass number	152
neutron number	91
relative atomic mass	151.923505185 ± 0.000027809 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	4.12 ± 0.08 m
spin	1
nuclear quadrupole moment
dydhyas diskudhans	1958
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵³Pm

mass number	153
neutron number	92
relative atomic mass	152.924156252 ± 0.000009729 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	5.25 ± 0.02 m
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1962
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵⁴Pm

mass number	154
neutron number	93
relative atomic mass	153.926712791 ± 0.000026861 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	2.68 ± 0.07 m
spin	4
nuclear quadrupole moment
dydhyas diskudhans	1958
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵⁵Pm

mass number	155
neutron number	94
relative atomic mass	154.928136951 ± 0.000005065 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	41.5 ± 0.2 s
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1982
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵⁶Pm

mass number	156
neutron number	95
relative atomic mass	155.931114059 ± 0.000001275 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	27.4 ± 0.5 s
spin	4
nuclear quadrupole moment
dydhyas diskudhans	1986
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵⁷Pm

mass number	157
neutron number	96
relative atomic mass	156.933121298 ± 0.000007521 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	10.56 ± 0.1 s
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1987
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵⁸Pm

mass number	158
neutron number	97
relative atomic mass	157.936546948 ± 0.000000953 Da
g-factor	0
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	4.8 ± 0.5 s
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1987
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁵⁹Pm

mass number	159
neutron number	98
relative atomic mass	158.939286409 ± 0.000010777 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	1.49 ± 0.13 s
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1998
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

¹⁶⁰Pm

mass number	160
neutron number	99
relative atomic mass	159.943215272 ± 0.0000022 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	725 ± 57 ms
spin	6
nuclear quadrupole moment
dydhyas diskudhans	2012
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

¹⁶¹Pm

mass number	161
neutron number	100
relative atomic mass	160.946229837 ± 0.0000097 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	1.05 ± 0.15 s
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	2012
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

¹⁶²Pm

mass number	162
neutron number	101
relative atomic mass	161.950574 ± 0.000322 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	630 ± 180 ms
spin	2
nuclear quadrupole moment
dydhyas diskudhans	2012
parity	+

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

¹⁶³Pm

mass number	163
neutron number	102
relative atomic mass	162.953881 ± 0.000429 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life	255 ± 25 ms
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	2012
parity	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

¹⁶⁴Pm

mass number	164
neutron number	103
relative atomic mass	163.958819 ± 0.000429 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	5
nuclear quadrupole moment
dydhyas diskudhans	2018
parity	-

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)

¹⁶⁵Pm

mass number	165
neutron number	104
relative atomic mass	164.96278 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ elven radyoweythresek
half-life
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	2018
parity	-

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)

istori

diskudher po dismyger	J.A. Marinsky, L.E. Glendenin, C.D. Coryell
location of discovery	United States
dydhyas diskudhans	1945
Etymologyl	Named for the Greek god, Prometheus.
pronunciation	pro-MEE-thi-em (en)

source

Abundance
Abundance in Earth's crust
natural abundance (Keynvor)
natural abundance (Korf)	0 %
natural abundance (meteoroid)	0 %
natural abundance (Howl)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

1	s	1.2042
2	p	4.2562
2	s	16.0296
3	d	13.9018
3	p	19.4461
3	s	19.8154
4	d	33.26
4	f	37.866
4	p	30.3768
4	s	29.3604
5	p	44.586
5	s	42.1645
6	s	51.6046

Promethyum on ChemicalAid

Australian Educational Vocabulary ID	scot/3562
CAS Registry Number	7440-12-2
ChEBI ID	33373
ChemSpider ID	22386
DSSTOX compound identifier	DTXCID9027738
DSSTox substance ID	DTXSID4047755
Den Store Danske ID	promethium
ECHA Substance Infocard ID	100.028.292
Encyclopædia Britannica Online ID	science/promethium
Encyclopædia Universalis ID	promethium
Freebase ID	/m/025s7xn
Gran Enciclopèdia Catalana ID	0134881
Great Russian Encyclopedia Online ID	3180073
InChI	InChI=1S/Pm
InChIKey	VQMWBBYLQSCNPO-UHFFFAOYSA-N
KBpedia ID	Promethium
Library of Congress authority ID	sh85107404
MeSH descriptor ID	D011399
NALT ID	59783
Namuwiki ID	프로메튬
National Library of Israel J9U ID	987007538888005171
OmegaWiki Defined Meaning	343233
PubChem CID	23944
Quora topic ID	Promethium
Römpp online ID	RD-16-04277
Store norske leksikon ID	promethium
Treccani ID	prometeo_res-d3acb1ea-e1d8-11df-9ef0-d5ce3506d72e
UNII	ZGV62C09KN
USGS Thesaurus ID	1546
WordNet 3.1 Synset ID	14675658-n
honanieth GND	4175917-5

Promethyum (Pm)

Physical Property

Chemical Property

other

Isotopes of Promethium

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

164Pm

165Pm

istori

source

Nuclear Screening Constants

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

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