70YbYtterbium173.045 u
Ytterbium (Yb)
Ytterbium is a lanthanide with atomic number 70, in period 6, in the f-block of the periodic table. Its atomic mass is 173.045 u and its electron configuration is [Xe] 4f¹⁴ 6s². Solid at 25 °C.
Key facts
| Atomic number | 70 |
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| Atomic mass | 173.045 u |
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| Category | Lanthanide |
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| Period | 6 |
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| Group | f-block, no group number |
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| Block | f |
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| Electron configuration | [Xe] 4f¹⁴ 6s² |
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| Electrons per shell | 2, 8, 18, 32, 8, 2 |
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| Electronegativity (Pauling) | --- |
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| Oxidation states | +2, +3common in bold |
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| State at 25 °C | Solid |
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| Melting point | 1092 K818.85 °C |
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| Boiling point | 1469 K1195.85 °C |
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| Density | 6.9 g/cm³ |
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Atomic properties
| First ionization energy | 6.254 eV |
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| Electron affinity | 50 kJ/mol |
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| Atomic radius | 194 pm |
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| Covalent radius | 187 pm |
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| Van der Waals radius | 242 pm |
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| Common ions | Yb³⁺, Yb²⁺ |
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| Protons, neutrons, electrons | 70, 103, 70 |
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Physical and thermal properties
| Molar volume | 24.84 cm³/mol |
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| Heat of fusion | 7.7 kJ/mol |
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| Heat of vaporization | 160 kJ/mol |
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| Specific heat | 154 J/(kg·K) |
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| Thermal conductivity | 39 W/(m·K) |
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| Thermal expansion | 2.63 × 10⁻⁵ K⁻¹ |
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| Mohs hardness | --- |
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| Young’s modulus | 24 GPa |
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| Crystal structure | Face-centered cubic |
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| Magnetic type | Paramagnetic |
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Identification and history
| CAS number | 7440-64-4 |
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| Latin name | Ytterbium |
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| Discovered by | Jean Ch. Galissard de Marignac · 1878 |
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| Named by | --- |
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Natural isotopes
| Isotope | Mass (u) | Abundance |
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| 168Yb | 167.933891 | 0.123 % |
| 170Yb | 169.934767 | 2.982 % |
| 171Yb | 170.936332 | 14.086 % |
| 172Yb | 171.936387 | 21.686 % |
| 173Yb | 172.938216 | 16.103 % |
| 174Yb | 173.938868 | 32.025 % |
| 176Yb | 175.942575 | 12.995 % |
Data checked against PubChem (NIH), IUPAC, the NIST Atomic Spectra Database and the IAEA (NUBASE and AME), the same data you see in the app.
A dash (---) means there is no reliable published measurement. The app never makes one up.
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Periodic Table