71 Lu
Lanthanide
Lutetium
Hardest, densest lanthanide.
Properties of Lutetium
- Atomic number (Z)
- 71
- Symbol
- Lu
- Atomic mass
- 174.97 g/mol
- Category
- Lanthanide
- Group
- 3
- Period
- 6
- Electron configuration
- [Xe] 4f¹⁴ 5d¹ 6s²
- Electronegativity (Pauling)
- 1.27
- Atomic radius
- 217 pm
- First ionization energy
- 524 kJ/mol
- Melting point
- 1925 K (1651.8 °C)
- Boiling point
- 3675 K (3401.8 °C)
- Density
- 9.84 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1907
Frequently asked questions
What is Lutetium?
Lutetium (Lu) is a lanthanide, element number 71 on the periodic table. Hardest, densest lanthanide.
What is the atomic number and atomic mass of Lutetium?
Lutetium has atomic number 71 and an atomic mass of about 174.97 g/mol.
What is the electron configuration of Lutetium?
The electron configuration of Lutetium is [Xe] 4f¹⁴ 5d¹ 6s².
Where is Lutetium on the periodic table?
Lutetium sits in group 3, period 6, and is classified as a lanthanide.