Hassium vs Meitnerium
Side-by-side comparison of Hassium (Hs, element 108) and Meitnerium (Mt, element 109) by atomic structure and physical properties.
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| Atomic number | 108 | 109 |
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| Symbol | Hs | Mt |
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| Name | Hassium | Meitnerium |
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| Category | transition-metal | transition-metal |
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| Standard Atomic Weight | 269 u | 278 u |
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| Period | 7 | 7 |
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| Group | 8 | 9 |
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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]5f146d67s2 | [Rn]5f146d77s2 (Calculated) |
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| Oxidation states | [3, 4, 6, 8] | [1, 3, 4, 6, 8, 9] |
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| Electronegativity (Pauling) | N/A | N/A |
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| Electron affinity | 1.1 eV | 1.7 eV |
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| Density | 4.07e+4 kg/m³ | 3.74e+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 | 1984 | 1982 |
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Key Differences
| Hs Hassium | Mt Meitnerium |
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| Standard Atomic Weight | 269 u ↓ lower | 278 u ↑ higher |
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| Density | 4.07e+4 kg/m³ ↑ higher | 3.74e+4 kg/m³ ↓ lower |
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| Electron affinity | 1.1 eV ↓ lower | 1.7 eV ↑ higher |
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| Group | 8 | 9 |
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| Electron configuration | [Rn]5f146d67s2 | [Rn]5f146d77s2 (Calculated) |
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| Discovery year | 1984 | 1982 |
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