Nobelium vs Lawrencium
Side-by-side comparison of Nobelium (No, element 102) and Lawrencium (Lr, element 103) by atomic structure and physical properties.
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| Atomic number | 102 | 103 |
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| Symbol | No | Lr |
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| Name | Nobelium | Lawrencium |
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| Category | actinide | actinide |
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| Standard Atomic Weight | 259 u | 266 u |
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| Period | 7 | 7 |
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| Group | N/A | 3 |
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| Block | f | d |
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| Phase at STP | Solid | Solid |
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| Electron configuration | [Rn]5f147s2 | [Rn]5f147s27p1 |
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| Oxidation states | [2, 3] | [3] |
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| Electronegativity (Pauling) | 1.3 | N/A |
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| Electron affinity | -2.36 eV | -0.31 eV |
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| Density | 9900 kg/m³ | 1.56e+4 kg/m³ |
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| Melting point | 826.85 °C | 1626.85 °C |
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| Boiling point | N/A | N/A |
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| Discovery year | 1957 | 1961 |
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Key Differences
| No Nobelium | Lr Lawrencium |
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| Standard Atomic Weight | 259 u ↓ lower | 266 u ↑ higher |
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| Density | 9900 kg/m³ ↓ lower | 1.56e+4 kg/m³ ↑ higher |
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| Melting point | 826.85 °C ↓ lower | 1626.85 °C ↑ higher |
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| Electron affinity | -2.36 eV ↓ lower | -0.31 eV ↑ higher |
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| Block | f | d |
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| Electron configuration | [Rn]5f147s2 | [Rn]5f147s27p1 |
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| Discovery year | 1957 | 1961 |
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