71 Lutetium 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 Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb[Lu] Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr +--------------------+ | 71 _ | | | | _ _ | | | | | | | | | | | |__| |_| | | | |_____\__,_| | | | | Lutetium | | 174.9668 u | +--------------------+ Electron Configuration: [Xe]6s2 4f14 5d1 Electronegativity: 1.27 Atomic Radius: 221 pm Ionization Energy: 5.426 eV Electron Affinity: Oxidation States: 3 Standard State: Solid Melting Point: 1936 K Boiling Point: 3675 K Density: 9.84 g/cm3 Family: Lanthanide Year Discovered: 1907 Number of Neutrons: 104 Number of Protons: 71 Number of Electrons: 71 Number of Valence: Valency: Group: Period: 6 Shell: f-shell Specific Heat: 0.154 J/g K Radioactive: 0 Occurrence: Natural Source: Merging neutron stars