Lutetium (Lu)

Lutetium is the 71st element in the periodic table and has a symbol of Lu and atomic number of 71. It has an atomic weight of 174.9668 and a mass number of 175. Lutetium has seventy-one protons and one hundred four neutrons in its nucleus, and seventy-one electrons in six shells. It is located in group Transition metals, period six and block f of the periodic table. Silvery-white rare-earth metal which is relatively stable in air. It happens to be the most expensive rare-earth metal. Its found with almost all rare-earth metals, but is very difficult to separate from other elements. Least abundant of all natural elements. Used in metal alloys, and as a catalyst in various processes. There are two natural, stable isotopes, and seven radioisotopes, the most stable being Lu-174 with a half-life of 3.3 years. The separation of lutetium from Ytterbium was described by Georges Urbain in 1907. It was discovered at approximately the same time by Carl Auer von Welsbach. The name comes from the Greek word lutetia which means Paris.

Atomic Number	71
Atomic Weight	174.9668
Mass Number	175

Group
Period	6
Block	f

Protons	71 p⁺
Neutrons	104 n⁰
Electrons	71 e^-

Properties

Physical Properties
Atomic Radius	175 pm 270 pm
Molar Volume	17.8 cm³/mol
Covalent Radius	162 pm 131 pm 131 pm 187 pm
Metallic Radius
Ionic Radius	86.1 pm 97.7 pm 103.2 pm
Crystal Radius	100.1 pm 111.7 pm 117.2 pm
Van der Waals Radius	224 pm 265 pm 364 pm
Density	9.84 g/cm³ 9,300 kg/m³
Energy
Proton Affinity	992 kJ/mol
Electron Affinity	0.34 eV/particle
Ionization Energy	5.425871 eV/particle 13.9 eV/particle 20.9551 eV/particle 45.249 eV/particle 66.79 eV/particle 98 eV/particle 117 eV/particle 136 eV/particle 159 eV/particle 185 eV/particle 205 eV/particle 238 eV/particle 276 eV/particle 305 eV/particle 328 eV/particle 361 eV/particle 399 eV/particle 438 eV/particle 476 eV/particle 520 eV/particle 560 eV/particle 600 eV/particle 640 eV/particle 670 eV/particle 713 eV/particle 941 eV/particle 985 eV/particle 1,032 eV/particle 1,081 eV/particle 1,130 eV/particle 1,178 eV/particle 1,242 eV/particle 1,292 eV/particle 1,345 eV/particle 1,395 eV/particle 1,591 eV/particle 1,641 eV/particle 1,696 eV/particle 1,747 eV/particle 1,875 eV/particle 1,933 eV/particle 2,067 eV/particle 2,125.5 eV/particle 3,590 eV/particle 3,706 eV/particle 3,828 eV/particle 3,960 eV/particle 4,086 eV/particle 4,211 eV/particle 4,403 eV/particle 4,532 eV/particle 4,673 eV/particle 4,803 eV/particle 5,168 eV/particle 5,282 eV/particle 5,408 eV/particle 5,525 eV/particle 5,937 eV/particle 6,070 eV/particle 6,326 eV/particle 6,452 eV/particle 14,228 eV/particle 14,542 eV/particle 14,890 eV/particle 15,211 eV/particle 16,730 eV/particle 17,120 eV/particle 17,610 eV/particle 17,928.05 eV/particle 72,322.91 eV/particle 73,804.8 eV/particle

Heat of Vaporization	414 kJ/mol
Heat of Fusion
Heat of Formation	427.6 kJ/mol
Electrons
Electron Shells	2, 8, 18, 32, 9, 2

Valence Electrons	2 ⓘ

Electron Configuration	[Xe] 4f¹⁴ 5d¹ 6s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f¹⁴ 5d¹ 6s²

Oxidation States	0, 2, 3
Electronegativity	6.455 eV/particle 0.22565 1
Electrophilicity Index	0.817098693336918 eV/particle
States of Matter
Phase	Solid
Gas Phase
Boiling Point	3,675.15 K
Melting Point	1,936.15 K
Critical Pressure
Critical Temperature
Triple Point
Visual
Lutetium is a Silver. Lu has a CPK of #ff1493, Jmol of #00ab24, and MOLCAS GV of #00ab24. The Appearance of Element 71 is silvery white.
Color	Silver #ff1493 #00ab24 #00ab24
Appearance	silvery white
Refractive Index
Thermodynamic Properties
Thermal Conductivity
Thermal Expansion	0.00001 1/K
Molar Heat Capacity	26.86 J/(mol K)
Specific Heat Capacity	0.154 J/(g⋅K)
Heat Capacity Ratio (Adiabatic Index)
Electrical Properties
Type	Conductor
Electrical Conductivity	1.8 MS/m
Electrical Resistivity	0.00000057 m Ω
Superconducting Point	0.1 K
Magnetism
Type	paramagnetic
Magnetic Susceptibility (Mass)	0.0000000012 m³/Kg
Magnetic Susceptibility (Molar)	0.00000000021 m³/mol
Magnetic Susceptibility (Volume)	0.0000118
Magnetic Ordering
Curie Point
Neel Point
Structure
The Crystal Structure of Lutetium is HEX. The lattice constant of Lu is 3.51 Å. The lattice angles of Element 71 are π/2, π/2, 2 π/3.
Crystal Structure	Simple Hexagonal (HEX)
Lattice Constant	3.51 Å
Lattice Angles	π/2, π/2, 2 π/3
Mechanical Properties
Lutetium has a Brinell of 893 MPa, and Vickers of 1160 MPa. The Bulk Modulus of Lu is 48 GPa. The Shear Modulus of Element 71 is 27 GPa. The Young Modulus of Lutetium (Lu) is 69 GPa. The Poisson Ratio of Lutetium is 0.26.
Hardness	893 MPa 1,160 MPa
Bulk Modulus	48 GPa
Shear Modulus	27 GPa
Young's Modulus	69 GPa
Poisson Ratio	0.26
Speed of Sound
Classification
The Glawe Number of Lutetium is 19. The Mendeleev Number of Lu is 41. The Pettifor Number of Element 71 is 21. The Geochemical Class of Lutetium (Lu) is rare earth & related. The Goldschmidt Class of Lutetium is litophile.
Category	Lanthanides, Transition metals
CAS Group
IUPAC Group
Glawe Number	19
Mendeleev Number	41
Pettifor Number	21
Geochemical Class	rare earth & related
Goldschmidt Class	litophile
Other
The Gas Basicity of Lutetium is 970.6 kJ/mol. The Dipole Polarizability of Lu is 137 plus or minus 7 a₀. Element 71 has a C6 Dispersion Coefficient (GB) of 2020 a₀. The Allotropes of Lutetium (Lu) is . The Neutron Cross Section of Lutetium is 85. The Neutron Mass Absorption of Lu is 0.022. The Quantum Numbers of Element 71 is 2D3/2. The Space Group of Lutetium (Lu) is 194 (P63/mmc).
Gas Basicity	970.6 kJ/mol
Dipole Polarizability	137 ± 7 a₀
C6 Dispersion Coefficient	2,020 a₀
Allotropes
Neutron Cross Section	85
Neutron Mass Absorption	0.022
Quantum Numbers	2D3/2
Space Group	194 (P63/mmc)

Isotopes of Lutetium

Stable Isotopes	1
Unstable Isotopes	38
Radioactive Isotopes	38

¹⁵⁰Lu

Mass Number	150
Neutron Number	79
Relative Atomic Mass	149.973407 ± 0.000322 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	45 ± 3 ms
Spin	5
Quadrupole Moment
Discovery Year	1993
Parity	-

Decay Mode	Intensity
p (proton emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

¹⁵¹Lu

Mass Number	151
Neutron Number	80
Relative Atomic Mass	150.967471 ± 0.000322 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	78.4 ± 0.9 ms
Spin	11/2
Quadrupole Moment
Discovery Year	1982
Parity	-

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

¹⁵²Lu

Mass Number	152
Neutron Number	81
Relative Atomic Mass	151.96412 ± 0.00021 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	650 ± 70 ms
Spin	4
Quadrupole Moment
Discovery Year	1987
Parity	-

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)	15%

¹⁵³Lu

Mass Number	153
Neutron Number	82
Relative Atomic Mass	152.958802248 ± 0.00016105 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	900 ± 200 ms
Spin	11/2
Quadrupole Moment
Discovery Year	1989
Parity	-

Decay Mode	Intensity
α (α emission)
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
p (proton emission)	0%

¹⁵⁴Lu

Mass Number	154
Neutron Number	83
Relative Atomic Mass	153.957416 ± 0.000216 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	2
Quadrupole Moment
Discovery Year	1981
Parity	-

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)

¹⁵⁵Lu

Mass Number	155
Neutron Number	84
Relative Atomic Mass	154.954326005 ± 0.00002066 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	68 ± 2 ms
Spin	11/2
Quadrupole Moment
Discovery Year	1965
Parity	-

Decay Mode	Intensity
α (α emission)	90%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	10%

¹⁵⁶Lu

Mass Number	156
Neutron Number	85
Relative Atomic Mass	155.953086606 ± 0.000058102 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	494 ± 12 ms
Spin	2
Quadrupole Moment
Discovery Year	1965
Parity

Decay Mode	Intensity
α (α emission)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

¹⁵⁷Lu

Mass Number	157
Neutron Number	86
Relative Atomic Mass	156.950144807 ± 0.000012961 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	7.7 ± 2 s
Spin	1/2
Quadrupole Moment	0
Discovery Year	1977
Parity	+

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)

¹⁵⁸Lu

Mass Number	158
Neutron Number	87
Relative Atomic Mass	157.94931562 ± 0.000016236 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	10.6 ± 0.3 s
Spin	2
Quadrupole Moment
Discovery Year	1979
Parity

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	99.09%
α (α emission)	0.91%

¹⁵⁹Lu

Mass Number	159
Neutron Number	88
Relative Atomic Mass	158.946635615 ± 0.000040433 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	12.1 ± 1 s
Spin	1/2
Quadrupole Moment	0
Discovery Year	1980
Parity	+

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)

¹⁶⁰Lu

Mass Number	160
Neutron Number	89
Relative Atomic Mass	159.946033 ± 0.000061 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	36.1 ± 0.3 s
Spin	2
Quadrupole Moment
Discovery Year	1979
Parity	-

Decay Mode	Intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
α (α emission)

¹⁶¹Lu

Mass Number	161
Neutron Number	90
Relative Atomic Mass	160.943572 ± 0.00003 Da
G-Factor	0.444 ± 0.006
Abundance
Radioactivity	☢️ Radioactive
Half Life	77 ± 2 s
Spin	1/2
Quadrupole Moment	0
Discovery Year	1973
Parity	+

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

¹⁶²Lu

Mass Number	162
Neutron Number	91
Relative Atomic Mass	161.943282776 ± 0.000080554 Da
G-Factor	0.0551 ± 0.0011
Abundance
Radioactivity	☢️ Radioactive
Half Life	1.37 ± 0.02 m
Spin	1
Quadrupole Moment	0.519 ± 0.008
Discovery Year	1978
Parity	-

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

¹⁶³Lu

Mass Number	163
Neutron Number	92
Relative Atomic Mass	162.941179 ± 0.00003 Da
G-Factor	0.1534 ± 0.002
Abundance
Radioactivity	☢️ Radioactive
Half Life	3.97 ± 0.13 m
Spin	1/2
Quadrupole Moment	0
Discovery Year	1979
Parity	+

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

¹⁶⁴Lu

Mass Number	164
Neutron Number	93
Relative Atomic Mass	163.941339 ± 0.00003 Da
G-Factor	0.0589 ± 0.0011
Abundance
Radioactivity	☢️ Radioactive
Half Life	3.14 ± 0.03 m
Spin	1
Quadrupole Moment	0.608 ± 0.007
Discovery Year	1977
Parity	-

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

¹⁶⁵Lu

Mass Number	165
Neutron Number	94
Relative Atomic Mass	164.939406758 ± 0.00002849 Da
G-Factor	-0.0488 ± 0.0006
Abundance
Radioactivity	☢️ Radioactive
Half Life	10.74 ± 0.1 m
Spin	1/2
Quadrupole Moment	0
Discovery Year	1973
Parity	+

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

¹⁶⁶Lu

Mass Number	166
Neutron Number	95
Relative Atomic Mass	165.939859 ± 0.000032 Da
G-Factor	0.48383333333333 ± 0.002
Abundance
Radioactivity	☢️ Radioactive
Half Life	2.65 ± 0.1 m
Spin	6
Quadrupole Moment	4.33 ± 0.04
Discovery Year	1969
Parity	-

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

¹⁶⁷Lu

Mass Number	167
Neutron Number	96
Relative Atomic Mass	166.938243 ± 0.00004 Da
G-Factor	0.66228571428571 ± 0.0011428571428571
Abundance
Radioactivity	☢️ Radioactive
Half Life	51.5 ± 1 m
Spin	7/2
Quadrupole Moment	3.28 ± 0.02
Discovery Year	1958
Parity	+

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

¹⁶⁸Lu

Mass Number	168
Neutron Number	97
Relative Atomic Mass	167.938729798 ± 0.000040766 Da
G-Factor	0.50116666666667 ± 0.0041666666666667
Abundance
Radioactivity	☢️ Radioactive
Half Life	5.5 ± 0.1 m
Spin	6
Quadrupole Moment	4.77 ± 0.06
Discovery Year	1960
Parity	-

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

¹⁶⁹Lu

Mass Number	169
Neutron Number	98
Relative Atomic Mass	168.937645845 ± 0.000003226 Da
G-Factor	0.65371428571429 ± 0.0011428571428571
Abundance
Radioactivity	☢️ Radioactive
Half Life	34.06 ± 0.05 h
Spin	7/2
Quadrupole Moment	3.48 ± 0.03
Discovery Year	1955
Parity	+

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

¹⁷⁰Lu

Mass Number	170
Neutron Number	99
Relative Atomic Mass	169.93847923 ± 0.000018081 Da
G-Factor	0
Abundance
Radioactivity	☢️ Radioactive
Half Life	2.012 ± 0.03 d
Spin	0
Quadrupole Moment	0
Discovery Year	1951
Parity	+

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

¹⁷¹Lu

Mass Number	171
Neutron Number	100
Relative Atomic Mass	170.937918591 ± 0.000001999 Da
G-Factor	0.65314285714286 ± 0.0011428571428571
Abundance
Radioactivity	☢️ Radioactive
Half Life	8.247 ± 0.023 d
Spin	7/2
Quadrupole Moment	3.53 ± 0.03
Discovery Year	1951
Parity	+

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

¹⁷²Lu

Mass Number	172
Neutron Number	101
Relative Atomic Mass	171.93909132 ± 0.000002507 Da
G-Factor	0.72275 ± 0.0025
Abundance
Radioactivity	☢️ Radioactive
Half Life	6.7 ± 0.03 d
Spin	4
Quadrupole Moment	3.8 ± 0.04
Discovery Year	1951
Parity	-

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

¹⁷³Lu

Mass Number	173
Neutron Number	102
Relative Atomic Mass	172.938935722 ± 0.000001682 Da
G-Factor	0.64942857142857 ± 0.00057142857142857
Abundance
Radioactivity	☢️ Radioactive
Half Life	1.37 ± 0.01 y
Spin	7/2
Quadrupole Moment	3.53 ± 0.02
Discovery Year	1951
Parity	+

Decay Mode	Intensity
ϵ (electron capture)	100%

¹⁷⁴Lu

Mass Number	174
Neutron Number	103
Relative Atomic Mass	173.94034284 ± 0.000001682 Da
G-Factor	1.982 ± 0.005
Abundance
Radioactivity	☢️ Radioactive
Half Life	3.31 ± 0.05 y
Spin	1
Quadrupole Moment	0.773 ± 0.007
Discovery Year	1951
Parity	-

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

¹⁷⁵Lu

Mass Number	175
Neutron Number	104
Relative Atomic Mass	174.940777211 ± 0.000001295 Da
G-Factor	0.63591428571429 ± 0.00054285714285714
Abundance	97.401 ± 0.013
Radioactivity	Stable
Half Life	Not Radioactive ☢️
Spin	7/2
Quadrupole Moment	3.49 ± 0.02
Discovery Year	1934
Parity	+

¹⁷⁶Lu

Mass Number	176
Neutron Number	105
Relative Atomic Mass	175.942691711 ± 0.000001301 Da
G-Factor	0.45142857142857 ± 0.00071428571428571
Abundance	2.599 ± 0.013
Radioactivity	☢️ Radioactive
Half Life	37.01 ± 0.17 Gy
Spin	7
Quadrupole Moment
Discovery Year	1935
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	0.45%

¹⁷⁷Lu

Mass Number	177
Neutron Number	106
Relative Atomic Mass	176.94376357 ± 0.00000131 Da
G-Factor	0.63757142857143 ± 0.0004
Abundance
Radioactivity	☢️ Radioactive
Half Life	6.6443 ± 0.0009 d
Spin	7/2
Quadrupole Moment	3.39 ± 0.03
Discovery Year	1945
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁷⁸Lu

Mass Number	178
Neutron Number	107
Relative Atomic Mass	177.945960065 ± 0.000002416 Da
G-Factor	-1.373 ± 0.009
Abundance
Radioactivity	☢️ Radioactive
Half Life	28.4 ± 0.2 m
Spin	1
Quadrupole Moment	0.708 ± 0.01
Discovery Year	1957
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁷⁹Lu

Mass Number	179
Neutron Number	108
Relative Atomic Mass	178.947332985 ± 0.000005528 Da
G-Factor	0.67657142857143 ± 0.0034285714285714
Abundance
Radioactivity	☢️ Radioactive
Half Life	4.59 ± 0.06 h
Spin	7/2
Quadrupole Moment	3.32 ± 0.03
Discovery Year	1961
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸⁰Lu

Mass Number	180
Neutron Number	109
Relative Atomic Mass	179.949890744 ± 0.000075926 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	5.7 ± 0.1 m
Spin	5
Quadrupole Moment
Discovery Year	1971
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸¹Lu

Mass Number	181
Neutron Number	110
Relative Atomic Mass	180.951908 ± 0.000135 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	3.5 ± 0.3 m
Spin	7/2
Quadrupole Moment
Discovery Year	1982
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸²Lu

Mass Number	182
Neutron Number	111
Relative Atomic Mass	181.955158 ± 0.000215 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	2 ± 0.2 m
Spin	1
Quadrupole Moment
Discovery Year	1982
Parity	-

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸³Lu

Mass Number	183
Neutron Number	112
Relative Atomic Mass	182.957363 ± 0.000086 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	58 ± 4 s
Spin	7/2
Quadrupole Moment
Discovery Year	1983
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸⁴Lu

Mass Number	184
Neutron Number	113
Relative Atomic Mass	183.96103 ± 0.000215 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life	20 ± 3 s
Spin	3
Quadrupole Moment
Discovery Year	1989
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)	100%

¹⁸⁵Lu

Mass Number	185
Neutron Number	114
Relative Atomic Mass	184.963542 ± 0.000322 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	7/2
Quadrupole Moment
Discovery Year	2009
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)

¹⁸⁶Lu

Mass Number	186
Neutron Number	115
Relative Atomic Mass	185.96745 ± 0.000429 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year	2012
Parity

Decay Mode	Intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)

¹⁸⁷Lu

Mass Number	187
Neutron Number	116
Relative Atomic Mass	186.970188 ± 0.000429 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin	7/2
Quadrupole Moment
Discovery Year	2012
Parity	+

Decay Mode	Intensity
β⁻ (β⁻ decay)

¹⁸⁸Lu

Mass Number	188
Neutron Number	117
Relative Atomic Mass	187.974428 ± 0.000429 Da
G-Factor
Abundance
Radioactivity	☢️ Radioactive
Half Life
Spin
Quadrupole Moment
Discovery Year	2012
Parity

Decay Mode	Intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)

History

French chemist Georges Urbain successfully separated lutetium from ytterbia in 1907 in Paris. Austrian scientist Carl Auer von Welsbach and American chemist Charles James also succeeded in isolating lutetium independently in the same year. Pure lutetium metal was first produced in 1953. Lutetia is the ancient name for Paris

Discoverers	Georges Urbain
Discovery Location	France
Discovery Year	1907
Etymology (Name Origin)	Named for the ancient name of Paris, Lutecia.
Pronunciation	loo-TEE-shi-em (English)

Lutetium is considered to be non toxic

Lutetium was the last natural rare earth element to be discovered

Uses

Lutetium oxide is used to make catalysts for cracking hydrocarbons in the petrochemical industry. Lutetium aluminum garnet has been proposed for use as a lens material in high refractive index immersion lithography. Lutetium is used as a phosphor in LED light bulbs. It has no practical applications.

Sources

Found with ytterbium in gadolinite and xenotime. Usually obtained from monazite sand which is ofter 50% rare earth by weight and 0.003% lutetium.

Abundance
Abundance in Earth's crust	0.8 mg/kg
Natural Abundance (Oceans)	0.00000015 mg/L
Natural Abundance (Human Body)
Natural Abundance (Meteor)	0.0000029 %
Natural Abundance (Sun)	0.0000001 %
Abundance in Universe	0.00000001 %

Nuclear Screening Constants

1	s	1.3805
2	p	4.389
2	s	18.5502
3	d	13.5812
3	p	20.8337
3	s	21.4655
4	d	35.7108
4	f	40.0688
4	p	33.8096
4	s	32.7308
5	d	50.887
5	p	52.32
5	s	50.045
6	s	62.1956

Also Known As

Lu
element 71
71Lu
cassiopium
lutecium

Translations

Frenchlutécium
Norwegian Bokmållutetium
GermanLutetium
Afrikaanslutetium
Amharicሉቴቲየም
Arabicلوتيشيوم
AzerbaijaniLutesium
Belarusianлютэцый
Bulgarianлутеций
Banglaলুটিশিয়াম
Bosnianlutecij
Catalanluteci
CorsicanLuteziu
Czechlutecium
ChuvashЛютеци
WelshLwtetiwm
Danishlutetium
Greekλουτήτιο
Esperantolutecio
Spanishlutecio
Estonianluteetsium
Basquelutezio
Persianلوتتیم
Finnishlutetium
FriulianLutezi
Irishlúitéitiam
Galicianlutecio
ManxLootaiçhum
Hakka Chineselutetium
Hebrewלוטציום
Hindiलुटीशियम
Fiji HindiLutetium
Croatianlutecij
Haitian CreoleLitesyòm
Hungarianlutécium
Armenianլուտեցիում
Interlingualutetium
Indonesianlutesium
Idolutecio
Icelandiclútetín
Italianlutezio
Japaneseルテチウム
Lojbanjinmrluteti
JavaneseLutetium
Georgianლუტეციუმი
Kannadaಲ್ಯುಟೇಶಿಯಮ್
Korean루테튬
KurdishLutesyûm
KomiЛютеций
Latinlutetium
LuxembourgishLutetium
LigurianLutesio
Lithuanianlutecis
Latvianlutēcijs
Malayalamലുറ്റീഷ്യം
Marathiलुटेटियम
Western MariЛӱтеций
MalayLutetium
Dutchlutetium
Norwegian Nynorsklutetium
Polishlutet
pnbلتیتیم
Portugueselutécio
QuechuaLutesyu
Romanianlutețiu
Russianлютеций
SakhaЛютециум
Sicilianlutezziu
Serbo-CroatianLutecijum
Slovaklutécium
Slovenianlutecij
Serbianлутецијум
Saterland FrisianLutetium
Swedishlutetium
Thaiลูทีเทียม
Turkishlutesyum
Uyghurلۇتېتسىي
Ukrainianлютецій
Urduلوٹیٹیئم
VepsLütecii
Vietnameseluteti
WarayLutesyo
KalmykЛютециум
YorubaLutetium
Chinese镥
BretonLutesiom
CebuanoLutesyo
Macedonianлутециум
Central Kurdishلووتیشیۆم
Gujaratiલ્યુટેશિયમ
Odiaଲ୍ୟୁଟେସିଅମ
Punjabiਲੁਟੀਸ਼ੀਅਮ
PiedmonteseLutessi
TatarЛютеций
Tamilலியுதேத்தியம்
Scotslutetium
SomaliLuteetiyaam
KazakhЛютеций
Cantonese鑥
Belarusian (Taraskievica orthography)Лютэц
AlbanianLutetiumi
UzbekLyutetsiy
AromanianLutețiu
KyrgyzЛютеций
Sanskritलुटेटियम
Malteselutezju
Bhojpuriलुटेटियम
Nepaliलुटेटियम
Paliलुटेटियम
Newariलुटेटियम
Scottish GaelicLutetium
Teluguలుటీషియం
cdoLutetium
Min Nan ChineseLutetium
FaroeseLutetium
AsturianLuteciu
LimburgishLutetium
Portuguese (Brazil)lutécio
Literary Chinese鑥
Tajikлютеций
Lingua Franca Novalutesio
TagalogLutesyo
kbpLʊtɛsɩyɔm
Chinese (Traditional)鎦
Chinese (Taiwan)鎦
Northern FrisianLuteetsium
oloL'utecii
Mongolianлютеци
Wu Chinese镥
Burmeseလူတက်သီယမ်
SardinianLutètziu
SwahiliLuteti
Moroccan Arabicلوطيسيوم
Egyptian Arabicلوتيشيوم
Pashtoلوتيتيوم
CornishLutetiom
BalineseLutésium
bclLutesyo
OccitanLutèci

Lutetium on ChemicalAid

Australian Educational Vocabulary ID	scot/3539
CAS Registry Number	7439-94-3
CPV Supplementary	AA24
ChEBI ID	33382
ChemSpider ID	22371
Common Procurement Vocabulary	14752000
DSSTOX compound identifier	DTXCID9027730
DSSTox substance ID	DTXSID5047746
Den Store Danske ID	lutetium
ECHA Substance Infocard ID	100.028.275
Elhuyar ZTH ID	027715
Encyclopædia Britannica Online ID	science/lutetium
Freebase ID	/m/025rz__
GND ID	4168341-9
Gran Enciclopèdia Catalana ID	0120691
Great Russian Encyclopedia Online ID	2162894
Hrvatska enciklopedija ID	37622
InChI	InChI=1S/Lu
InChIKey	OHSVLFRHMCKCQY-UHFFFAOYSA-N
KBpedia ID	Lutetium
Library of Congress authority ID	sh85078994
MeSH descriptor ID	D008187
NALT ID	50778
Namuwiki ID	루테튬
National Library of Israel J9U ID	987007538781805171
OmegaWiki Defined Meaning	161929
OpenAlex ID	C520551903
PubChem CID	23929
Quora topic ID	Lutetium
RxNorm ID	1534772
Römpp online ID	RD-12-01809
Store norske leksikon ID	lutetium
Treccani ID	lutezio
UNII	5H0DOZ21UJ
USGS Thesaurus ID	1497
WordNet 3.1 Synset ID	14668241-n

Lutetium (Lu)

Properties

Isotopes of Lutetium

150Lu

151Lu

152Lu

153Lu

154Lu

155Lu

156Lu

157Lu

158Lu

159Lu

160Lu

161Lu

162Lu

163Lu

164Lu

165Lu

166Lu

167Lu

168Lu

169Lu

170Lu

171Lu

172Lu

173Lu

174Lu

175Lu

176Lu

177Lu

178Lu

179Lu

180Lu

181Lu

182Lu

183Lu

184Lu

185Lu

186Lu

187Lu

188Lu