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| Content-Length | 2.15 kB |
| Size | 512x512 |
#85 Astatine - rarity ZERO-KELVIN
| 1st ionization energy | 9.5 eV | 0.85% |
|---|---|---|
| appearance | Dark gray (predicted) | 0.85% |
| atomic mass | 210 u | 0.85% |
| atomic number | 85 | 0.85% |
| atomic radius | 202 picometers (van der Waals radius) | 4.24% |
| cas number | 7440-68-8 | 0.85% |
| category | Halogens | 3.39% |
| crystal structure | FCC (face centered cubic) | 11.02% |
| density | no data | 0.85% |
| electronegativity | 2.2 (Pauling scale) | 5.08% |
| electronic configuration | [Xe] 4f14 5d10 6s2 6p5 | 0.85% |
| electrons | 85 | 0.85% |
| electrons arrangement | 2, 8, 18, 32, 18, 7 | 0.85% |
| main isotopes | 210At and 211At | 0.85% |
| neutrons | 125 | 2.54% |
| position | Group: 17, Period: 6, Block: p | 0.85% |
| rarity | ZERO-KELVIN | 33.33% |
| state | Solid | 72.88% |
| symbol | At | 0.85% |
| valence electrons | 7 | 3.39% |
| who discovered | Emilio Segre, Dale Corson, Kenneth Ross Mackenzie (in 1940) | 0.85% |
Total Rarity Score: 1689.05
Rarity: #88/354