Teirbiam (Tb)

element with the atomic number of 65

Atomic Number	65
Atomic Weight	158.92535
mass number	159

Group
Period	6
Block	f

proton	65 p⁺
neutron	94 n⁰
electron	65 e^-

Physical Property

Atomic Radius	175 pm 276 pm
molar volume	19.2 cm³/mol
covalent radius	168 pm 135 pm 194 pm
Metallic Radius
ionic radius	92.3 pm 98 pm 104 pm 109.5 pm 76 pm 88 pm
Crystal Radius	106.3 pm 112 pm 118 pm 123.5 pm 90 pm 102 pm
Van der Waals radius	233 pm 270 pm 345.1 pm
density	8.23 g/cm³ 7,650 kg/m³

Chemical Property

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proton affinity
electron affinity	1.165 eV/particle
ionization energy	5.8638 eV/particle 11.52 eV/particle 21.91 eV/particle 39.36 eV/particle 66.5 eV/particle 90 eV/particle 108 eV/particle 125 eV/particle 143 eV/particle 168 eV/particle 186 eV/particle 216 eV/particle 250 eV/particle 270 eV/particle 294 eV/particle 325 eV/particle 358 eV/particle 393 eV/particle 426.6 eV/particle 613 eV/particle 651 eV/particle 690 eV/particle 732 eV/particle 772 eV/particle 816 eV/particle 866 eV/particle 909 eV/particle 954 eV/particle 997 eV/particle 1,165 eV/particle 1,208 eV/particle 1,256 eV/particle 1,301 eV/particle 1,393 eV/particle 1,443 eV/particle 1,559 eV/particle 1,610.38 eV/particle 2,750 eV/particle 2,852 eV/particle 2,961 eV/particle 3,078 eV/particle 3,189 eV/particle 3,300 eV/particle 3,458 eV/particle 3,573 eV/particle 3,698 eV/particle 3,814 eV/particle 4,139 eV/particle 4,242 eV/particle 4,355 eV/particle 4,460 eV/particle 4,760 eV/particle 4,877 eV/particle 5,103 eV/particle 5,217 eV/particle 11,673 eV/particle 11,957 eV/particle 12,272 eV/particle 12,563 eV/particle 13,658 eV/particle 14,003 eV/particle 14,434 eV/particle 14,721 eV/particle 59,739.25 eV/particle 61,049.64 eV/particle

enthalpy of vaporization	389 kJ/mol
enthalpy of fusion
standard enthalpy of formation	388.7 kJ/mol
electron

electron shell	2, 8, 18, 27, 8, 2

valence electron	2 ⓘ

electron configuration	[Xe] 4f⁹ 6s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f⁹ 6s²

oxidation number	0, 1, 2, 3, 4
electronegativity	0.198863
Electrophilicity Index	1.3142725121307568 eV/particle
fundamental state of matter

phase of matter
gaseous state of matter
Boiling Point	3,503.15 K
Melting Point	1,632.15 K
critical pressure
critical temperature
triple point
appearance
dath	Black #ff1493 #30ffc7 #30ffc7
appearance	silvery white
refractive index
thermodynamic material property
Thermal Conductivity	11.1 W/(m K)
thermal expansion	0.0000103 1/K
molar heat capacity	28.91 J/(mol K)
Specific Heat Capacity	0.182 J/(g⋅K)
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	0.83 MS/m
electrical resistivity	0.0000012 Ω*m
superconductivity
magnetism
type	paramagnetic
magnetic susceptibility (Mass)	0.0000136 m³/Kg
magnetic susceptibility (Molar)	0.000002161385 m³/mol
magnetic susceptibility (Volume)	0.1117784
magnetic ordering
Curie temperature	222 K
Néel temperature	230 K
structure
Crystal Structure	{ERROR}
lattice constant	3.6 Å
Lattice Angles	π/2, π/2, 2 π/3
mechanical property
hardness	677 MPa 863 MPa
bulk modulus	38.7 GPa
shear modulus	22 GPa
Young's modulus	56 GPa
Poisson's ratio	0.26
speed of sound	2,620 m/s
classification
Category	Actinides, Lanthanides
CAS Group
IUPAC Group
Glawe Number	25
Mendeleev Number	29
Pettifor Number	26
Geochemical Class	rare earth & related
Goldschmidt classification	litophile

other

Gas Basicity
polarizability	170 ± 20 a₀
C6 Dispersion Coefficient	2,590 a₀
allotrope
Neutron cross section	23
Neutron Mass Absorption	0.009
quantum number	6H15/2
space group	194 (P63/mmc)

Isotopes of Terbium

Stable Isotopes	1
Unstable Isotopes	39
Natural Isotopes	1

¹³⁵Tb

mass number	135
neutron number	70
Relative Atomic Mass	134.964516 ± 0.000429 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	1.01 ± 0.28 ms
spin	7/2
nuclear quadrupole moment
time of discovery or invention	2004
parity	-

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

¹³⁶Tb

mass number	136
neutron number	71
Relative Atomic Mass	135.96146 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	5
nuclear quadrupole moment
time of discovery or invention
parity	-

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

¹³⁷Tb

mass number	137
neutron number	72
Relative Atomic Mass	136.95602 ± 0.00043 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	3/2
nuclear quadrupole moment
time of discovery or invention
parity	+

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

¹³⁸Tb

mass number	138
neutron number	73
Relative Atomic Mass	137.953193 ± 0.000322 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	2
nuclear quadrupole moment
time of discovery or invention	1993
parity	+

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

¹³⁹Tb

mass number	139
neutron number	74
Relative Atomic Mass	138.94833 ± 0.00032 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	1.6 ± 0.2 s
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1999
parity	-

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

¹⁴⁰Tb

mass number	140
neutron number	75
Relative Atomic Mass	139.945805048 ± 0.000859359 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	2.29 ± 0.15 s
spin	7
nuclear quadrupole moment
time of discovery or invention	1986
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
ϵ (electron capture)	3%
β⁺ p (β⁺-delayed proton emission)	0.26%

¹⁴¹Tb

mass number	141
neutron number	76
Relative Atomic Mass	140.941448 ± 0.000113 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	3.5 ± 0.2 s
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1986
parity	-

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

¹⁴²Tb

mass number	142
neutron number	77
Relative Atomic Mass	141.939280858 ± 0.000752079 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	597 ± 17 ms
spin	1
nuclear quadrupole moment
time of discovery or invention	1991
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
e⁺ (positron emission)	96.8%
ϵ (electron capture)	3.2%
β⁺ p (β⁺-delayed proton emission)	0.0022%

¹⁴³Tb

mass number	143
neutron number	78
Relative Atomic Mass	142.935137332 ± 0.000055 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	12 ± 1 s
spin	11/2
nuclear quadrupole moment
time of discovery or invention	1985
parity	-

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

¹⁴⁴Tb

mass number	144
neutron number	79
Relative Atomic Mass	143.933045 ± 0.00003 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	1
nuclear quadrupole moment
time of discovery or invention	1982
parity	+

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

¹⁴⁵Tb

mass number	145
neutron number	80
Relative Atomic Mass	144.928717001 ± 0.000119051 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	30.9 ± 0.6 s
spin	11/2
nuclear quadrupole moment
time of discovery or invention	1981
parity	-

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

¹⁴⁶Tb

mass number	146
neutron number	81
Relative Atomic Mass	145.927252739 ± 0.000048159 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	8 ± 4 s
spin	1
nuclear quadrupole moment
time of discovery or invention	1974
parity	+

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

¹⁴⁷Tb

mass number	147
neutron number	82
Relative Atomic Mass	146.92405462 ± 0.000008691 Da
g-factor	3.42 ± 0.1
natural abundance
radioactivity	☢️ radioactive element
half-life	1.64 ± 0.03 h
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1969
parity	+

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

¹⁴⁸Tb

mass number	148
neutron number	83
Relative Atomic Mass	147.924275476 ± 0.000013379 Da
g-factor	-0.88 ± 0.01
natural abundance
radioactivity	☢️ radioactive element
half-life	60 ± 1 m
spin	2
nuclear quadrupole moment	-0.3 ± 0.2
time of discovery or invention	1960
parity	-

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

¹⁴⁹Tb

mass number	149
neutron number	84
Relative Atomic Mass	148.923253792 ± 0.000003895 Da
g-factor	2.72 ± 0.04
natural abundance
radioactivity	☢️ radioactive element
half-life	4.118 ± 0.025 h
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1950
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	83.3%
α (α emission)	16.7%

¹⁵⁰Tb

mass number	150
neutron number	85
Relative Atomic Mass	149.923664799 ± 0.000007912 Da
g-factor	-0.45 ± 0.01
natural abundance
radioactivity	☢️ radioactive element
half-life	3.48 ± 0.16 h
spin	2
nuclear quadrupole moment
time of discovery or invention	1959
parity

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

¹⁵¹Tb

mass number	151
neutron number	86
Relative Atomic Mass	150.92310897 ± 0.000004395 Da
g-factor	1.852 ± 0.012
natural abundance
radioactivity	☢️ radioactive element
half-life	17.609 ± 0.001 h
spin	1/2
nuclear quadrupole moment	0
time of discovery or invention	1953
parity	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	99.9905%
α (α emission)	0.0095%

¹⁵²Tb

mass number	152
neutron number	87
Relative Atomic Mass	151.924081855 ± 0.000042955 Da
g-factor	-0.29 ± 0.01
natural abundance
radioactivity	☢️ radioactive element
half-life	17.5 ± 0.1 h
spin	2
nuclear quadrupole moment	0.34 ± 0.13
time of discovery or invention	1959
parity	-

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

¹⁵³Tb

mass number	153
neutron number	88
Relative Atomic Mass	152.923441694 ± 0.000004237 Da
g-factor	1.388 ± 0.008
natural abundance
radioactivity	☢️ radioactive element
half-life	2.34 ± 0.01 d
spin	5/2
nuclear quadrupole moment	1.08 ± 0.14
time of discovery or invention	1957
parity	+

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

¹⁵⁴Tb

mass number	154
neutron number	89
Relative Atomic Mass	153.924683681 ± 0.000048641 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	9.994 ± 0.039 h
spin	3
nuclear quadrupole moment
time of discovery or invention	1972
parity	-

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

¹⁵⁵Tb

mass number	155
neutron number	90
Relative Atomic Mass	154.923509511 ± 0.000010552 Da
g-factor	1.3533333333333 ± 0.013333333333333
natural abundance
radioactivity	☢️ radioactive element
half-life	5.32 ± 0.06 d
spin	3/2
nuclear quadrupole moment	1.41 ± 0.06
time of discovery or invention	1957
parity	+

decay mode	intensity
ϵ (electron capture)	100%

¹⁵⁶Tb

mass number	156
neutron number	91
Relative Atomic Mass	155.924754209 ± 0.000004044 Da
g-factor	0.56666666666667 ± 0.066666666666667
natural abundance
radioactivity	☢️ radioactive element
half-life	5.35 ± 0.1 d
spin	3
nuclear quadrupole moment	2.3 ± 0.8
time of discovery or invention	1950
parity	-

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

¹⁵⁷Tb

mass number	157
neutron number	92
Relative Atomic Mass	156.924031888 ± 0.000001092 Da
g-factor	1.3533333333333 ± 0.013333333333333
natural abundance
radioactivity	☢️ radioactive element
half-life	71 ± 7 y
spin	3/2
nuclear quadrupole moment	1.4 ± 0.08
time of discovery or invention	1960
parity	+

decay mode	intensity
ϵ (electron capture)	100%

¹⁵⁸Tb

mass number	158
neutron number	93
Relative Atomic Mass	157.925419942 ± 0.00000136 Da
g-factor	0.58433333333333 ± 0.0023333333333333
natural abundance
radioactivity	☢️ radioactive element
half-life	180 ± 11 y
spin	3
nuclear quadrupole moment
time of discovery or invention	1957
parity	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	83.4%
β⁻ (β⁻ decay)	16.6%

¹⁵⁹Tb

mass number	159
neutron number	94
Relative Atomic Mass	158.925353707 ± 0.000001184 Da
g-factor	1.3393333333333 ± 0.0026666666666667
natural abundance	100
radioactivity	stable isotope
half-life	Not Radioactive ☢️
spin	3/2
nuclear quadrupole moment	1.432 ± 0.008
time of discovery or invention	1933
parity	+

¹⁶⁰Tb

mass number	160
neutron number	95
Relative Atomic Mass	159.927174553 ± 0.000001191 Da
g-factor	0.566 ± 0.0026666666666667
natural abundance
radioactivity	☢️ radioactive element
half-life	72.3 ± 0.2 d
spin	3
nuclear quadrupole moment	3.85 ± 0.05
time of discovery or invention	1943
parity	-

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

¹⁶¹Tb

mass number	161
neutron number	96
Relative Atomic Mass	160.927576806 ± 0.000001308 Da
g-factor	1.4666666666667 ± 0.066666666666667
natural abundance
radioactivity	☢️ radioactive element
half-life	6.948 ± 0.005 d
spin	3/2
nuclear quadrupole moment	1.3 ± 0.6
time of discovery or invention	1949
parity	+

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

¹⁶²Tb

mass number	162
neutron number	97
Relative Atomic Mass	161.9292754 ± 0.0000022 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	7.6 ± 0.15 m
spin	1
nuclear quadrupole moment
time of discovery or invention	1965
parity	-

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

¹⁶³Tb

mass number	163
neutron number	98
Relative Atomic Mass	162.930653609 ± 0.000004358 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	19.5 ± 0.3 m
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1966
parity	+

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

¹⁶⁴Tb

mass number	164
neutron number	99
Relative Atomic Mass	163.933327561 ± 0.000002 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	3 ± 0.1 m
spin	5
nuclear quadrupole moment
time of discovery or invention	1968
parity	+

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

¹⁶⁵Tb

mass number	165
neutron number	100
Relative Atomic Mass	164.934955198 ± 0.000001654 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	2.11 ± 0.1 m
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1983
parity	+

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

¹⁶⁶Tb

mass number	166
neutron number	101
Relative Atomic Mass	165.937939727 ± 0.00000157 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	27.1 ± 1.5 s
spin	1
nuclear quadrupole moment
time of discovery or invention	1996
parity	-

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

¹⁶⁷Tb

mass number	167
neutron number	102
Relative Atomic Mass	166.940007046 ± 0.000002071 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	18.9 ± 1.6 s
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1999
parity	+

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

¹⁶⁸Tb

mass number	168
neutron number	103
Relative Atomic Mass	167.943337074 ± 0.0000045 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	9.4 ± 0.4 s
spin	4
nuclear quadrupole moment
time of discovery or invention	1999
parity	-

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

¹⁶⁹Tb

mass number	169
neutron number	104
Relative Atomic Mass	168.945807 ± 0.000322 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	5.13 ± 0.32 s
spin	3/2
nuclear quadrupole moment
time of discovery or invention	2012
parity	+

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

¹⁷⁰Tb

mass number	170
neutron number	105
Relative Atomic Mass	169.949855 ± 0.000322 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	960 ± 78 ms
spin	2
nuclear quadrupole moment
time of discovery or invention	2012
parity	-

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

¹⁷¹Tb

mass number	171
neutron number	106
Relative Atomic Mass	170.953011 ± 0.000429 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	1.23 ± 0.1 s
spin	3/2
nuclear quadrupole moment
time of discovery or invention	2012
parity	+

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

¹⁷²Tb

mass number	172
neutron number	107
Relative Atomic Mass	171.957391 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life	760 ± 190 ms
spin	6
nuclear quadrupole moment
time of discovery or invention	2012
parity	+

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

¹⁷³Tb

mass number	173
neutron number	108
Relative Atomic Mass	172.960805 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	3/2
nuclear quadrupole moment
time of discovery or invention	2018
parity	+

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

¹⁷⁴Tb

mass number	174
neutron number	109
Relative Atomic Mass	173.965679 ± 0.000537 Da
g-factor
natural abundance
radioactivity	☢️ radioactive element
half-life
spin	2
nuclear quadrupole moment
time of discovery or invention	2018
parity	-

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

eachdraidh

discoverer or inventor	Carl Mosander
location of discovery	Sweden
time of discovery or invention	1843
Facal-fhreumachd	Named after Ytterby, a village in Sweden.
pronunciation	TUR-bi-em (Beurla)

source

Abundance
Abundance in Earth's crust	1.2 mg/kg
natural abundance (cuan)	0.00000014 mg/L
natural abundance (human body)
natural abundance (Dreag)	0.0000039 %
natural abundance (Grian)	0.00000001 %
Abundance in Universe	0.00000005 %

Nuclear Screening Constants

1	s	1.2739
2	p	4.3076
2	s	17.0278
3	d	13.7015
3	p	19.9853
3	s	20.4485
4	d	34.69
4	f	39.1352
4	p	31.6012
4	s	30.98
5	p	48.039
5	s	45.8295
6	s	56.6996

Teirbiam on ChemicalAid

Teirbiam (Tb)

Physical Property

Chemical Property

other

Isotopes of Terbium

135Tb

136Tb

137Tb

138Tb

139Tb

140Tb

141Tb

142Tb

143Tb

144Tb

145Tb

146Tb

147Tb

148Tb

149Tb

150Tb

151Tb

152Tb

153Tb

154Tb

155Tb

156Tb

157Tb

158Tb

159Tb

160Tb

161Tb

162Tb

163Tb

164Tb

165Tb

166Tb

167Tb

168Tb

169Tb

170Tb

171Tb

172Tb

173Tb

174Tb

eachdraidh

source

Nuclear Screening Constants

¹³⁵Tb

¹³⁶Tb

¹³⁷Tb

¹³⁸Tb

¹³⁹Tb

¹⁴⁰Tb

¹⁴¹Tb

¹⁴²Tb

¹⁴³Tb

¹⁴⁴Tb

¹⁴⁵Tb

¹⁴⁶Tb

¹⁴⁷Tb

¹⁴⁸Tb

¹⁴⁹Tb

¹⁵⁰Tb

¹⁵¹Tb

¹⁵²Tb

¹⁵³Tb

¹⁵⁴Tb

¹⁵⁵Tb

¹⁵⁶Tb

¹⁵⁷Tb

¹⁵⁸Tb

¹⁵⁹Tb

¹⁶⁰Tb

¹⁶¹Tb

¹⁶²Tb

¹⁶³Tb

¹⁶⁴Tb

¹⁶⁵Tb

¹⁶⁶Tb

¹⁶⁷Tb

¹⁶⁸Tb

¹⁶⁹Tb

¹⁷⁰Tb

¹⁷¹Tb

¹⁷²Tb

¹⁷³Tb

¹⁷⁴Tb