Lutetium (Lu)
Lutetium
Lutetium (Lu) is a lanthanide in period 6. Its relative atomic mass is 174.97 and the molar mass of the atom is 174.97 g/mol.
Atomic number 71
Atomic mass 174.97
Molar mass 174.97 g/mol
Category Lanthanide Solid
Properties of lutetium
| Atomic number | 71 |
|---|---|
| Symbol | Lu |
| Latin name | Lutetium |
| Relative atomic mass | 174.97 |
| Molar mass | 174.97 g/mol |
| Group, period, block | —, 6, f |
| Category | Lanthanide |
| State at 20 °C | Solid |
| Electron configuration | [Xe] 4f¹⁴ 5d¹ 6s² |
| Electronegativity (Pauling) | 1.27 |
| Atomic radius | 175 pm |
Electron configuration of lutetium
Electrons per shell
K2L8M18N32O9P2
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹ 6s²
Noble-gas notation
71 protons · 71 electrons[Xe] 4f¹⁴ 5d¹ 6s²
Formula and compounds of lutetium
Simple substanceLulutetiumMolar mass of Lu: 174.97 g/mol
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Frequently asked questions
The relative atomic mass of lutetium is 174.97, so the molar mass of the atom is 174.97 g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹ 6s². Noble-gas notation: [Xe] 4f¹⁴ 5d¹ 6s².