Lutetium

71
Lu
Group
n/a
Period
6
Block
d
Protons
Electrons
Neutrons
71
71
104
General Properties
Atomic Number
71
Atomic Weight
174.9668
Mass Number
175
Category
Lanthanides
Colour
Silver
Radioactive
No
Lutetia is the ancient name for Paris
Crystal Structure
Simple Hexagonal
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.
Electrons per shell
2, 8, 18, 32, 9, 2
Electron Configuration
[Xe] 4f14 5d1 6s2
Lu
Lutetium was the last natural rare earth element to be discovered
Physical Properties
Phase
Solid
Density
9.84 g/cm3
Melting Point
1925.15 K | 1652 °C | 3005.6 °F
Boiling Point
3675.15 K | 3402 °C | 6155.6 °F
Heat of Fusion
22 kJ/mol
Heat of Vaporization
415 kJ/mol
Specific Heat Capacity
0.154 J/g·K
Abundance in Earth's crust
0.000056%
Abundance in Universe
1×10-8%
Ultrapure
Image Credits: Images-of-elements
Ultrapure piece of lutetium
CAS Number
7439-94-3
PubChem CID Number
23929
Atomic Properties
Atomic Radius
174 pm
Covalent Radius
187 pm
Electronegativity
1.27 (Pauling scale)
Ionization Potential
5.4259 eV
Atomic Volume
17.78 cm3/mol
Thermal Conductivity
0.164 W/cm·K
Oxidation States
3
Applications
Lutetium oxide is used to make catalysts for cracking hydrocarbons in the petrochemical industry.

Lutetium aluminium 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.
Lutetium is considered to be non toxic
Isotopes
Stable Isotopes
175Lu
Unstable Isotopes
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, 176Lu, 177Lu, 178Lu, 179Lu, 180Lu, 181Lu, 182Lu, 183Lu, 184Lu