Protactinium vs Uranium
Side-by-side comparison of Protactinium (Pa, element 91) and Uranium (U, element 92) by atomic structure and physical properties.
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| Atomic number | 91 | 92 |
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| Symbol | Pa | U |
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| Name | Protactinium | Uranium |
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| Category | actinide | actinide |
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| Standard Atomic Weight | 231.03588 u | 238.02891 u |
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| Period | 7 | 7 |
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| Group | N/A | N/A |
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| Block | f | f |
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| Phase at STP | Solid | Solid |
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| Electron configuration | [Rn]5f26d17s2 | [Rn]5f36d17s2 |
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| Oxidation states | [2, 3, 4, 5] | [-1, 1, 2, 3, 4, 5, 6] |
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| Electronegativity (Pauling) | 1.5 | 1.38 |
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| Electron affinity | 0.55 eV | 0.31497 eV |
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| Density | 1.537e+4 kg/m³ | 1.895e+4 kg/m³ |
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| Melting point | 1571.85 °C | 1134.85 °C |
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| Boiling point | N/A | 4130.85 °C |
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| Discovery year | 1913 | 1789 |
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Key Differences
| Pa Protactinium | U Uranium |
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| Standard Atomic Weight | 231.03588 u ↓ lower | 238.02891 u ↑ higher |
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| Density | 1.537e+4 kg/m³ ↓ lower | 1.895e+4 kg/m³ ↑ higher |
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| Melting point | 1571.85 °C ↑ higher | 1134.85 °C ↓ lower |
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| Electronegativity (Pauling) | 1.5 ↑ higher | 1.38 ↓ lower |
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| Electron affinity | 0.55 eV ↑ higher | 0.31497 eV ↓ lower |
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| Electron configuration | [Rn]5f26d17s2 | [Rn]5f36d17s2 |
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| Discovery year | 1913 | 1789 |
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