71 - Lutetium lanthanide
Discovered by Georges Urbain in 1907
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.
H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 32 | 2 in 4s + 6 in 4p + 10 in 4d + 14 in 4f |
| 5 | 9 | 2 in 5s + 6 in 5p + 1 in 5d |
| 6 | 2 | 2 in 6s |
silvery white Appearance
175 u Atomic Mass
1.75 Å Atomic Radius
3.68k K Boiling Point
17 Group
3 Common Oxidation States
1.87 Å Covalent Radius
9.84 g/cm³ Density
33.4 kJ/mol Electron Affinity
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d1 Electron Configuration
[Xe] 4f14 5d1 6s2 Electron Configuration (semantic)
1.27 Electronegativity
71 Electrons
5.43 eV First Ionization Energy
3 ICSD Oxidation States
523.5, 1340, 2022.3, 4370, 6445 kJ/mol Ionization Energies
1.94k K Melting Point
20 Mendeleev Number
26.9 J/(mol·K) Molar Heat
6 Number of Shells
104 Neutrons
71 Atomic Number
22 Number of Isotopes
3 Oxidation States
6 Period
Solid Phase
71 Protons
2, 8, 18, 32, 9, 2 Electron Shell Occupations