Elements
71

Lu

Lutetium

Lutetium (Lu) is a silvery-white coloured metal that has the atomic number 71 in the periodic table. It is a Lanthanide metal. It has the symbol Lu.

Lutetium was the last rare earth metal to be discovered in the mineral Ytterbia by Carl Auer von Welsbach, Charles James, and Georges Urbain. It was Urbain who successfully separated out Lutetium in 1907 using nitric acid. It exists in the earth’s crust in minerals and ores and whilst rare is more abundant than gold and silver. Lutetium oxide is used in catalysts in the petroleum industry and Lu -177 the isotope is used in cancer treatments due to its radioactivity. Lutetium atoms are the smallest of all the lanthanides meaning it has the highest melting and boiling points. It is a solid metal at room temperature with a melting point of 1652°c and a boiling point of 3402°c.

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FAQ's

What is the Melting Point for Lutetium?

Lutetium has a Melting Point of 1663°F, meaning at 1663°F it will turn to a liquid.

What is the Boiling Point for Lutetium?

Lutetium has a Boiling Point of 3402°F, meaning at 3402°F it will turn to a Gas.

What is the Electronegativity of Lutetium?

Lutetium's Electronegativty is 1.27. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Lutetium?

Lutetium has a Heat of Vaporization of 355.9 kJ/mol.

Uses

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.

71
Protons
71
Electrons
104
Neutrons

Lu

Element Symbol
Lu
Atomic Weight
174.967
Atomic Number
71
State
Solid
Melting Point
Unknown
1663
°C
Boiling Point
3402
Unknown
°C
Heat of Vaporization
355.9
Unknown
kJ/mol
Crystal Structure
Hexagonal
Thermoconductivity
0.164
Unknown
W/cmK
Shells
2,8,18,32,9,2
Group
Lanthanide
Period
6
Block
D Block
Orbitals
[Xe] 4f14 5d1 6s2
Coefficient of Thermal Expansion
8.2 10^-6 K^-1
Covalent Radius
1.56 Å
Density at 293K
9.85 g/cm³
Electrical Conductivity
0.0185 10^6/cm ohm
First Ionization Potential
5.4259 V
Second Ionization Potential
13.888 V
Third Ionization Potential
20.957 V
Ionic Radius
.98 (+3) Å
Oxydation States
3
Lattice Parameter
3.5032 Å
Lattice Parameter 2
--
Lattice Parameter 3
--
Pronounced

loo-TEE-shi-em

Discovered by

Georges Urbain

Discovery date

1907

Orbital configuration
2,8,18,32,9,2

Download the Periodic Table

Explore Other Lanthanides

158.925
65

Tb

Terbium
164.93
67

Ho

Holmium
140.908
59

Pr

Praseodymium
157.25
64

Gd

Gadolinium
151.964
63

Eu

Europium
144.24
60

Nd

Neodymium
140.116
58

Ce

Cerium
162.5
66

Dy

Dysprosium
138.905
57

La

Lanthanum
167.259
68

Er

Erbium
150.36
62

Sm

Samarium
173.045
70

Yb

Ytterbium
145
61

Pm

Promethium
168.934
69

Tm

Thulium
The lanthanide series contains 15 metallic elements from number 57 (lanthanum) to 71 (lutetium). They are located in group 3 and in the f-block of period six in the periodic table.
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Ytterbium

70
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Hafnium

72