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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 State(s)	+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