71
Lu
174.97
Lutetium (Lu)
Element 71 · Period 6 · Lanthanide series
lanthanide
solid at room temp
f-block
About Lutetium
Last lanthanoid. Used in PET scanners and cancer therapy.
Physical Properties
Atomic Mass
174.97 u
State at 25°C
Solid
Melting Point
1663 °C
Boiling Point
3402 °C
Density
9.84 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Xe] 4f¹⁴ 5d¹ 6s²
Electron Shells
2, 8, 18, 32, 9, 2
Electronegativity
1.27
Atomic Radius
217 pm
Ionization Energy
524 kJ/mol
Oxidation States
+3
Discovery & History
Discovered By
Georges Urbain
Discovery Year
1906
Named By
Georges Urbain
Name origin: Latin: Lutetia (Paris)
Frequently Asked Questions
- Is Lutetium a metal, nonmetal, or metalloid?
- Lutetium is classified as a lanthanide.
- What state is Lutetium in at room temperature?
- Lutetium is a solid at standard room temperature (25°C).
- What is the atomic mass of Lutetium?
- Lutetium has an atomic mass of 174.97 atomic mass units (u).
- Who discovered Lutetium?
- Lutetium was discovered by Georges Urbain in 1906.
- Where is Lutetium on the periodic table?
- Lutetium is element number 71, located in period 6, part of the lanthanide series shown below the main table.