Periodic Table
71
Lu
174.97
Lutetium
LanthanoidLast lanthanoid; 4f¹⁴5d¹; smallest Ln (contraction).
Electronic Configuration
[Xe] 4f¹⁴ 5d¹ 6s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f¹⁴ 5d¹ 6s²
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
32e⁻n=4
9e⁻n=5
2e⁻n=6
Properties
Atomic number
71
Atomic mass
174.97 u
Category
Lanthanoid
Block / Group / Period
d · 3 · 6
Valence electrons
2
Oxidation states
+3
Electronegativity
1.27
Atomic radius
217 pm
Ionization energy
524 kJ/mol
Electron affinity
50 kJ/mol
Melting point
1925 K / 1652 °C
Boiling point
3675 K / 3402 °C
Density
9.84 g/cm³
State at 25 °C
solid
Personal Notes
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