Erbium (Er)

chemical element with atomic number 68

Atomic Number	68
Atomic Weight	167.259
Nombor jisim	166

Group
Period	6
Block	f

proton	68 p⁺
neutron	98 n⁰
Elektron	68 e^-

Sifat Fizikal

Jejari Atom	175 pm 272 pm
molar volume	18.4 cm³/mol
Jejari kovalen	165 pm 133 pm 189 pm
Metallic Radius
ionic radius	89 pm 94.5 pm 100.4 pm 106.2 pm
Crystal Radius	103 pm 108.5 pm 114.4 pm 120.2 pm
Jejari van der Waals	229 pm 267 pm 339.1 pm
ketumpatan	9.07 g/cm³ 8,860 kg/m³

Sifat Kimia

{ERROR}

tenaga

proton affinity
Pertalian elektron
ionization energy	6.1077 eV/particle 11.93 eV/particle 22.74 eV/particle 42.7 eV/particle 65.1 eV/particle 96 eV/particle 114 eV/particle 131 eV/particle 158 eV/particle 177 eV/particle 201 eV/particle 235 eV/particle 268 eV/particle 290 eV/particle 311 eV/particle 345 eV/particle 381 eV/particle 415 eV/particle 450 eV/particle 486 eV/particle 520 eV/particle 555 eV/particle 770 eV/particle 810 eV/particle 853 eV/particle 899 eV/particle 943 eV/particle 989 eV/particle 1,046 eV/particle 1,092 eV/particle 1,142 eV/particle 1,188 eV/particle 1,370 eV/particle 1,416 eV/particle 1,468 eV/particle 1,516 eV/particle 1,625 eV/particle 1,678 eV/particle 1,803 eV/particle 1,859 eV/particle 3,157 eV/particle 3,265 eV/particle 3,381 eV/particle 3,505 eV/particle 3,624 eV/particle 3,742 eV/particle 3,916 eV/particle 4,038 eV/particle 4,170 eV/particle 4,294 eV/particle 4,639 eV/particle 4,748 eV/particle 4,866 eV/particle 4,978 eV/particle 5,329 eV/particle 5,455 eV/particle 5,695 eV/particle 5,815 eV/particle 12,918 eV/particle 13,217 eV/particle 13,548 eV/particle 13,855 eV/particle 15,146 eV/particle 15,511 eV/particle 15,971 eV/particle 16,274.56 eV/particle 65,848.24 eV/particle 67,241.85 eV/particle

Entalpi pengewapan	317 kJ/mol
entalpi pelakuran
standard enthalpy of formation	316.4 kJ/mol
Elektron

Petala elektron	2, 8, 18, 30, 8, 2

Elektron valens	2 ⓘ

tatarajah elektron	[Xe] 4f¹² 6s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f¹² 6s²

Keadaan pengoksidaan	0, 2, 3
Keelektronegatifan	0.212261 1.24
Electrophilicity Index
keadaan jirim asas

fasa jirim
gaseous state of matter
Boiling Point	3,141.15 K
Melting Point	1,802.15 K
critical pressure
critical temperature
triple point
rupa
warna	Black #ff1493 #00e675 #00e675
rupa	silvery white
indeks biasan
sifat bahan
Thermal Conductivity
Pengembangan terma	0.0000122 1/K
molar heat capacity	28.12 J/(mol K)
Specific Heat Capacity	0.168 J/(g⋅K)
heat capacity ratio
electrical properties
type	Conductor
Kekonduksian elektrik	1.2 MS/m
Kerintangan dan kekonduksian elektrik	0.00000086 Ω*m
Kesuperkonduksian
kemagnetan
type	paramagnetic
magnetic susceptibility (Mass)	0.00000377 m³/Kg
magnetic susceptibility (Molar)	0.000000630566 m³/mol
magnetic susceptibility (Volume)	0.0341788
magnetic ordering
Suhu Curie	32 K
Néel temperature	82 K
struktur
Crystal Structure	{ERROR}
lattice constant	3.56 Å
Lattice Angles	π/2, π/2, 2 π/3
mechanical property
hardness	814 MPa 589 MPa
Modulus pukal	44 GPa
shear modulus	28 GPa
Young's modulus	70 GPa
Nisbah Poisson	0.24
Kelajuan bunyi	2,830 m/s
pengelasan
Category	Actinides, Lanthanides
CAS Group
IUPAC Group
Glawe Number	22
Mendeleev Number	35
Pettifor Number	23
Geochemical Class	rare earth & related
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	150 ± 10 a₀
C6 Dispersion Coefficient	2,150 a₀
allotrope
Neutron cross section	165
Neutron Mass Absorption	0.036
Nombor kuantum	3H6
space group	194 (P63/mmc)

Isotopes of Erbium

Stable Isotopes	3
Unstable Isotopes	36
Natural Isotopes	6

¹⁴²Er

Nombor jisim	142
nombor neutron	74
Jisim Atom Relatif	141.970016 ± 0.000537 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	0
nuclear quadrupole moment	0
tarikh penemuan
parity	+

decay mode	Keamatan (fizik)
p (proton emission)

¹⁴³Er

Nombor jisim	143
nombor neutron	75
Jisim Atom Relatif	142.966548 ± 0.000429 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	9/2
nuclear quadrupole moment
tarikh penemuan	2005
parity	-

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

¹⁴⁴Er

Nombor jisim	144
nombor neutron	76
Jisim Atom Relatif	143.9607 ± 0.00021 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	2003
parity	+

decay mode	Keamatan (fizik)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

¹⁴⁵Er

Nombor jisim	145
nombor neutron	77
Jisim Atom Relatif	144.957874 ± 0.000215 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	900 ± 200 ms
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	1989
parity	+

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

¹⁴⁶Er

Nombor jisim	146
nombor neutron	78
Jisim Atom Relatif	145.952418357 ± 0.000007197 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	1.7 ± 0.6 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1993
parity	+

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

¹⁴⁷Er

Nombor jisim	147
nombor neutron	79
Jisim Atom Relatif	146.949964456 ± 0.000041 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	3.2 ± 1.2 s
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	1992
parity	+

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

¹⁴⁸Er

Nombor jisim	148
nombor neutron	80
Jisim Atom Relatif	147.944735026 ± 0.000011 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	4.6 ± 0.2 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1982
parity	+

decay mode	Keamatan (fizik)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	0.15%

¹⁴⁹Er

Nombor jisim	149
nombor neutron	81
Jisim Atom Relatif	148.942306 ± 0.00003 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	4 ± 2 s
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	1984
parity	+

decay mode	Keamatan (fizik)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	7%

¹⁵⁰Er

Nombor jisim	150
nombor neutron	82
Jisim Atom Relatif	149.937915524 ± 0.000018458 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	18.5 ± 0.7 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1982
parity	+

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

¹⁵¹Er

Nombor jisim	151
nombor neutron	83
Jisim Atom Relatif	150.937448567 ± 0.000017681 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	23.5 ± 2 s
Spin	7/2
nuclear quadrupole moment
tarikh penemuan	1970
parity	-

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

¹⁵²Er

Nombor jisim	152
nombor neutron	84
Jisim Atom Relatif	151.935050347 ± 0.000009478 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	10.3 ± 0.1 s
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1963
parity	+

decay mode	Keamatan (fizik)
α (α emission)	90%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	10%

¹⁵³Er

Nombor jisim	153
nombor neutron	85
Jisim Atom Relatif	152.93508635 ± 0.000009967 Da
g-factor	-0.26628571428571 ± 0.002
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	37.1 ± 0.2 s
Spin	7/2
nuclear quadrupole moment	-0.42 ± 0.02
tarikh penemuan	1963
parity	-

decay mode	Keamatan (fizik)
α (α emission)	53%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	47%

¹⁵⁴Er

Nombor jisim	154
nombor neutron	86
Jisim Atom Relatif	153.932790799 ± 0.000005325 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	3.73 ± 0.09 m
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1963
parity	+

decay mode	Keamatan (fizik)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	0.47%

¹⁵⁵Er

Nombor jisim	155
nombor neutron	87
Jisim Atom Relatif	154.93321571 ± 0.00000652 Da
g-factor	-0.19028571428571 ± 0.0014285714285714
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	5.3 ± 0.3 m
Spin	7/2
nuclear quadrupole moment	-0.27 ± 0.02
tarikh penemuan	1969
parity	-

decay mode	Keamatan (fizik)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	99.978%
α (α emission)	0.022%

¹⁵⁶Er

Nombor jisim	156
nombor neutron	88
Jisim Atom Relatif	155.931065926 ± 0.00002644 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	19.5 ± 1 m
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1967
parity	+

decay mode	Keamatan (fizik)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)	1.2%

¹⁵⁷Er

Nombor jisim	157
nombor neutron	89
Jisim Atom Relatif	156.931922652 ± 0.000028454 Da
g-factor	-0.274 ± 0.002
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	18.65 ± 0.1 m
Spin	3/2
nuclear quadrupole moment	0.92 ± 0.01
tarikh penemuan	1966
parity	-

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

¹⁵⁸Er

Nombor jisim	158
nombor neutron	90
Jisim Atom Relatif	157.929893474 ± 0.000027074 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	2.29 ± 0.06 h
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1961
parity	+

decay mode	Keamatan (fizik)
ϵ (electron capture)	100%

¹⁵⁹Er

Nombor jisim	159
nombor neutron	91
Jisim Atom Relatif	158.93069079 ± 0.00000391 Da
g-factor	-0.202 ± 0.0013333333333333
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	36 ± 1 m
Spin	3/2
nuclear quadrupole moment	1.17 ± 0.01
tarikh penemuan	1962
parity	-

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

¹⁶⁰Er

Nombor jisim	160
nombor neutron	92
Jisim Atom Relatif	159.929077193 ± 0.000026029 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	28.58 ± 0.09 h
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1954
parity	+

decay mode	Keamatan (fizik)
ϵ (electron capture)	100%

¹⁶¹Er

Nombor jisim	161
nombor neutron	93
Jisim Atom Relatif	160.93000353 ± 0.000009419 Da
g-factor	-0.24266666666667 ± 0.002
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	3.21 ± 0.03 h
Spin	3/2
nuclear quadrupole moment	1.363 ± 0.008
tarikh penemuan	1954
parity	-

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

¹⁶²Er

Nombor jisim	162
nombor neutron	94
Jisim Atom Relatif	161.928787299 ± 0.000000811 Da
g-factor	0
natural abundance	0.139 ± 0.005
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1938
parity	+

decay mode	Keamatan (fizik)
α (α emission)
2β⁺ (double β⁺ decay)

¹⁶³Er

Nombor jisim	163
nombor neutron	95
Jisim Atom Relatif	162.930039908 ± 0.000004967 Da
g-factor	0.2224 ± 0.0016
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	75 ± 0.4 m
Spin	5/2
nuclear quadrupole moment	2.56 ± 0.02
tarikh penemuan	1953
parity	-

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

¹⁶⁴Er

Nombor jisim	164
nombor neutron	96
Jisim Atom Relatif	163.929207739 ± 0.000000755 Da
g-factor	0
natural abundance	1.601 ± 0.003
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1938
parity	+

decay mode	Keamatan (fizik)
α (α emission)
2β⁺ (double β⁺ decay)

¹⁶⁵Er

Nombor jisim	165
nombor neutron	97
Jisim Atom Relatif	164.930733482 ± 0.000000985 Da
g-factor	0.2564 ± 0.0016
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	10.36 ± 0.04 h
Spin	5/2
nuclear quadrupole moment	2.71 ± 0.03
tarikh penemuan	1950
parity	-

decay mode	Keamatan (fizik)
ϵ (electron capture)	100%

¹⁶⁶Er

Nombor jisim	166
nombor neutron	98
Jisim Atom Relatif	165.930301067 ± 0.000000358 Da
g-factor	0
natural abundance	33.503 ± 0.036
Reputan radioaktif	Isotop stabil
setengah hayat	Not Radioactive ☢️
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1934
parity	+

¹⁶⁷Er

Nombor jisim	167
nombor neutron	99
Jisim Atom Relatif	166.932056192 ± 0.000000306 Da
g-factor	-0.16065714285714 ± 0.00011428571428571
natural abundance	22.869 ± 0.009
Reputan radioaktif	Isotop stabil
setengah hayat	Not Radioactive ☢️
Spin	7/2
nuclear quadrupole moment	3.57 ± 0.03
tarikh penemuan	1934
parity	+

¹⁶⁸Er

Nombor jisim	168
nombor neutron	100
Jisim Atom Relatif	167.932378282 ± 0.00000028 Da
g-factor	0
natural abundance	26.978 ± 0.018
Reputan radioaktif	Isotop stabil
setengah hayat	Not Radioactive ☢️
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1934
parity	+

¹⁶⁹Er

Nombor jisim	169
nombor neutron	101
Jisim Atom Relatif	168.934598444 ± 0.000000326 Da
g-factor	0.9656 ± 0.0008
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	9.392 ± 0.018 d
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	1956
parity	-

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

¹⁷⁰Er

Nombor jisim	170
nombor neutron	102
Jisim Atom Relatif	169.935471933 ± 0.000001488 Da
g-factor	0
natural abundance	14.91 ± 0.036
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1934
parity	+

decay mode	Keamatan (fizik)
2β⁻ (double β⁻ decay)
α (α emission)

¹⁷¹Er

Nombor jisim	171
nombor neutron	103
Jisim Atom Relatif	170.938037372 ± 0.000001511 Da
g-factor	0.2628 ± 0.004
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	7.516 ± 0.002 h
Spin	5/2
nuclear quadrupole moment	2.86 ± 0.09
tarikh penemuan	1938
parity	-

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

¹⁷²Er

Nombor jisim	172
nombor neutron	104
Jisim Atom Relatif	171.939363461 ± 0.000004253 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	49.3 ± 0.5 h
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1956
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

¹⁷³Er

Nombor jisim	173
nombor neutron	105
Jisim Atom Relatif	172.9424 ± 0.00021 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	1.434 ± 0.017 m
Spin	7/2
nuclear quadrupole moment
tarikh penemuan	1972
parity	-

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

¹⁷⁴Er

Nombor jisim	174
nombor neutron	106
Jisim Atom Relatif	173.94423 ± 0.00032 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	3.2 ± 0.2 m
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	1989
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

¹⁷⁵Er

Nombor jisim	175
nombor neutron	107
Jisim Atom Relatif	174.94777 ± 0.00043 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat	1.2 ± 0.3 m
Spin	9/2
nuclear quadrupole moment
tarikh penemuan	1996
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)	100%

¹⁷⁶Er

Nombor jisim	176
nombor neutron	108
Jisim Atom Relatif	175.94994 ± 0.00043 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	2012
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)

¹⁷⁷Er

Nombor jisim	177
nombor neutron	109
Jisim Atom Relatif	176.95399 ± 0.00054 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	1/2
nuclear quadrupole moment	0
tarikh penemuan	2012
parity	-

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)

¹⁷⁸Er

Nombor jisim	178
nombor neutron	110
Jisim Atom Relatif	177.956779 ± 0.00064 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	2012
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)

¹⁷⁹Er

Nombor jisim	179
nombor neutron	111
Jisim Atom Relatif	178.961267 ± 0.000537 Da
g-factor
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	3/2
nuclear quadrupole moment
tarikh penemuan	2018
parity	-

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)

¹⁸⁰Er

Nombor jisim	180
nombor neutron	112
Jisim Atom Relatif	179.96438 ± 0.000537 Da
g-factor	0
natural abundance
Reputan radioaktif	☢️ radioactive element
setengah hayat
Spin	0
nuclear quadrupole moment	0
tarikh penemuan	2018
parity	+

decay mode	Keamatan (fizik)
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)

sejarah

penemu atau pereka	Carl Mosander
tempat penemuan	Sweden
tarikh penemuan	1843
Etimologi	Named after the Swedish town, Ytterby.
sebutan	UR-bi-em (Inggeris)

sumber

Abundance
Abundance in Earth's crust	3.5 mg/kg
natural abundance (lautan)	0.00000087 mg/L
natural abundance (Tubuh manusia)
natural abundance (Meteoroid)	0.000018 %
natural abundance (Matahari)	0.0000001 %
Abundance in Universe	0.0000002 %

Nuclear Screening Constants

1	s	1.3263
2	p	4.346
2	s	17.7984
3	d	13.6397
3	p	20.3891
3	s	20.9231
4	d	35.7288
4	f	40.0216
4	p	32.8908
4	s	31.768
5	p	50.528
5	s	48.282
6	s	59.5238

Erbium on ChemicalAid

Erbium (Er)

Sifat Fizikal

Sifat Kimia

other

Isotopes of Erbium

142Er

143Er

144Er

145Er

146Er

147Er

148Er

149Er

150Er

151Er

152Er

153Er

154Er

155Er

156Er

157Er

158Er

159Er

160Er

161Er

162Er

163Er

164Er

165Er

166Er

167Er

168Er

169Er

170Er

171Er

172Er

173Er

174Er

175Er

176Er

177Er

178Er

179Er

180Er

sejarah

sumber

Nuclear Screening Constants

¹⁴²Er

¹⁴³Er

¹⁴⁴Er

¹⁴⁵Er

¹⁴⁶Er

¹⁴⁷Er

¹⁴⁸Er

¹⁴⁹Er

¹⁵⁰Er

¹⁵¹Er

¹⁵²Er

¹⁵³Er

¹⁵⁴Er

¹⁵⁵Er

¹⁵⁶Er

¹⁵⁷Er

¹⁵⁸Er

¹⁵⁹Er

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