| Content-Type | image/png |
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| Content-Length | 6.37 kB |
| Size | 512x512 |
#34 Selenium - rarity ZERO-KELVIN
| 1st ionization energy | 9.752 eV | 0.85% |
|---|---|---|
| appearance | Hexagonal selenium is: Metallic-grey,Monoclinic selenium is: Deep red | 0.85% |
| atomic mass | 78.971 u | 0.85% |
| atomic number | 34 | 0.85% |
| atomic radius | 190 picometers (van der Waals radius) | 0.85% |
| boiling point | 958 K or 685 °C or 1265 °F | 0.85% |
| cas number | 7482-49-2 | 0.85% |
| cas number of (cl2) | - | 99.15% |
| category | Nonmetals | 2.54% |
| crystal structure | HEX (Hexagonal) | 3.39% |
| density | 4.82 g/cm3 | 0.85% |
| electronegativity | 2.55 (Pauling scale) | 1.69% |
| electronic configuration | [Ar] 3d10 4s2 4p4 | 0.85% |
| electrons | 34 | 0.85% |
| electrons arrangement | 2, 8, 18, 6 | 0.85% |
| main isotopes | 80Se | 0.85% |
| melting point | 494 K or 221 °C or 430 °F | 0.85% |
| neutrons | 45 | 1.69% |
| position | Group: 16, Period: 4, Block: p | 0.85% |
| rarity | ZERO-KELVIN | 33.33% |
| state | Solid | 72.88% |
| sublimation point | - | 99.15% |
| symbol | Se | 0.85% |
| valence electrons | 6 | 4.24% |
| who discovered | Jöns Jakob Berzelius and Johann Gottlieb Gahn (In 1817) | 0.85% |
Total Rarity Score: 2104.82
Rarity: #20/354