Ytterbium is a chemical element with the symbol Yb and atomic number 70. It is the fourteenth and penultimate element in the lanthanide series, which is the basis of the relative stability of its +2 oxidation state.
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
Heat of vaporization： 129 kJ/mol
Molar heat capacity： 26.74 J/(mol·K)
At present, ytterbium is mainly used as a dopant of stainless steel or active laser media, and less often as a gamma ray source.