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< Back Ytterbium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 70 Atomic Symbol Yb Atomic Weight 173.04 amu Group Rare Earth (Lanthanide Series) Form Solid Density @ STP 6.9 g/cm3 Melting Point 819 °C (1506.2 °F, 1092.15 °K) Boiling Point 1196 °C (2184.8 °F, 1469.15 °K) Heat of Fusion 7.66 kJ/mol Heat of Vaporization 160 kJ/mol First Ionization Potential 6.25416 eV Specific Heat Capacity 0.155 J/g K Ground State Electron Configuration 4f14 5s2 5p6 6s2 Oxidation States +2, +3 Stable Isotopes and Natural Abundance on Earth 168Yb, 0.13%; 170Yb, 3.05%; 171Yb, 14.3%; 172Yb, 21.9%; 173Yb, 16.12%; 174Yb, 31.8%; 176Yb, 12.7% Selected Radioisotopes 169Yb Atomic Radius 222 pm Crystal Structure Cubic Discovered by Galissard de Marignac, 1878

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