Ytterbium, 70 General properties Pronunciation Template:Infobox element/pronunciation Appearance silvery white; with a pale yellow tint[1] Standard atomic weight (A r, standard ) Template:Infobox element/standard atomic weight Mass number Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)Ytterbium in the periodic table Template:Infobox element/periodic table Atomic number (Z ) 70 Group Template:Infobox element/group Period period 6 Block f-block Element category Template:Infobox element/category format Electron configuration [Xe ] 4f14 6s2 Electrons per shell
2, 8, 18, 32, 8, 2 Physical properties Phase at STP solid Melting point 1097 K (824 °C, 1515 °F) Boiling point 1469 K (1196 °C, 2185 °F) Density (near r.t. ) 6.90 g/cm3 when liquid (at m.p. ) 6.21 g/cm3 Heat of fusion 7.66 kJ/mol [[Enthalpy of vaporization|Heat of Template:Engvar ]] 129 kJ/mol Molar heat capacity 26.74 J/(mol·K) [[Vapor pressure|Template:Engvar pressure Atomic properties Oxidation states Template:Infobox element/symbol-to-oxidation-state Electronegativity Pauling scale: 1.1 (?) [[Ionization energy|Template:Engvar energies]] 1st: 603.4 kJ/mol 2nd: 1174.8 kJ/mol 3rd: 2417 kJ/mol Atomic radius empirical: 176 pm Covalent radius 187±8 pm Template:Infobox element/spectral lines Other properties Crystal structure Template:Infobox element/crystal structure Speed of sound thin rod 1590 m/s (at 20 °C) Thermal expansion β, poly: 26.3 µm/(m·K) (r.t. ) Thermal conductivity 38.5 W/(m·K) Electrical resistivity β, poly: 0.250 µΩ·m (at r.t. ) Magnetic ordering paramagnetic Magnetic susceptibility +249.0·10−6 cm3 /mol (2928 K)[2] Young's modulus β form: 23.9 GPa Shear modulus β form: 9.9 GPa Bulk modulus β form: 30.5 GPa Poisson ratio β form: 0.207 Vickers hardness 205–250 MPa Brinell hardness 340–440 MPa CAS Number 7440-64-4 History Naming after Ytterby (Sweden), where it was mined Discovery Jean Charles Galissard de Marignac (1878) First isolation Carl Auer von Welsbach (1906) Main isotopes of ytterbium Template:Infobox element/isotopes table | references
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