Meitnerium vs Darmstadtium
Side-by-side comparison of Meitnerium (Mt, element 109) and Darmstadtium (Ds, element 110) by atomic structure and physical properties.
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| Atomic number | 109 | 110 |
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| Symbol | Mt | Ds |
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| Name | Meitnerium | Darmstadtium |
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| Category | transition-metal | transition-metal |
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| Standard Atomic Weight | 278 u | 281 u |
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| Period | 7 | 7 |
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| Group | 9 | 10 |
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| Block | d | d |
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| Phase at STP | N/A | N/A |
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| Electron configuration | [Rn]5f146d77s2 (Calculated) | [Rn]5f146d87s2 (Predicted) |
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| Oxidation states | [1, 3, 4, 6, 8, 9] | [0, 2, 4, 6, 8] |
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| Electronegativity (Pauling) | N/A | N/A |
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| Electron affinity | 1.7 eV | 1.6 eV |
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| Density | 3.74e+4 kg/m³ | 3.48e+4 kg/m³ |
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| Melting point | N/A | N/A |
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| Boiling point | N/A | N/A |
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| Discovery year | 1982 | 1994 |
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Key Differences
| Mt Meitnerium | Ds Darmstadtium |
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| Standard Atomic Weight | 278 u ↓ lower | 281 u ↑ higher |
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| Density | 3.74e+4 kg/m³ ↑ higher | 3.48e+4 kg/m³ ↓ lower |
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| Electron affinity | 1.7 eV ↑ higher | 1.6 eV ↓ lower |
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| Group | 9 | 10 |
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| Electron configuration | [Rn]5f146d77s2 (Calculated) | [Rn]5f146d87s2 (Predicted) |
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| Discovery year | 1982 | 1994 |
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