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#43 Technetium - rarity BROWNIAN-MANIACS
| 1st ionization energy | 7.28 eV | 0.85% |
|---|---|---|
| appearance | Shiny gray metallic luster | 0.85% |
| atomic mass | 98 u | 0.85% |
| atomic number | 43 | 0.85% |
| atomic radius | 209 picometers (van der Waals radius) | 3.39% |
| boiling point | 4538 K or 4265 °C or 7709 °F | 0.85% |
| cas number | 7440-26-8 | 0.85% |
| cas number of (cl2) | - | 99.15% |
| category | Transition metals | 25.42% |
| crystal structure | HCP (Hexagonal close packing) | 6.78% |
| density | 11.5 g/cm3 | 0.85% |
| electronegativity | 1.9 (Pauling scale) | 3.39% |
| electronic configuration | [Kr] 4d5 5s2 | 0.85% |
| electrons | 43 | 0.85% |
| electrons arrangement | 2, 8, 18, 13, 2 | 0.85% |
| main isotopes | - | 7.63% |
| melting point | 2430 K or 2157 °C or 3915 °F | 0.85% |
| neutrons | 55 | 0.85% |
| position | Group: 7, Period: 5, Block: d | 0.85% |
| rarity | BROWNIAN-MANIACS | 33.33% |
| state | Solid | 72.88% |
| sublimation point | - | 99.15% |
| symbol | Tc | 0.85% |
| valence electrons | - | 61.02% |
| who discovered | Carlo Perrier and Emilio Segrè in 1973 | 0.85% |
Total Rarity Score: 1868.82
Rarity: #75/354