71Lu174.967
Lanthanided-block
Lutetium
Element 71 on the periodic table, symbol Lu, group 3, period 6.
Lutetium is a chemical element with symbol Lu and atomic number 71. It is a silvery white metal, which resists corrosion in dry, but not in moist air. It is considered the first element of the 6th-period transition metals and the last element in the lanthanide series, and is traditionally counted among the rare earths.
Appearance: silvery white
Properties
- Atomic Number
- 71
- Atomic Mass
- 174.9668 u
- Group
- 3
- Period
- 6
- Block
- d-block
- Category
- Lanthanide
- State at 25 °C
- Solid
- Melting Point
- 1,925 K · 1,651.9 °C
- Boiling Point
- 3,675 K · 3,401.9 °C
- Density
- 9.841 g/cm³
- Atomic Radius
- 175 pm
- Electronegativity
- 1.27
- Oxidation States
- +3
- Abundance in Crust
- 0.8 mg/kg
- Discovered
- 1907
- Discovered By
- Georges Urbain
Electron Configuration
[Xe] 4f14 5d1 6s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d1
Ionisation Energies (kJ/mol)
- 1. 523.5
- 2. 1,340
- 3. 2,022.3
- 4. 4,370
- 5. 6,445
Elements near Lutetium
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.