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| Content-Length | 5.64 kB |
| Size | 512x512 |
#19 Potassium - rarity ZERO-KELVIN
| 1st ionization energy | 4.341 eV | 0.85% |
|---|---|---|
| appearance | Silvery gray | 0.85% |
| atomic mass | 39.098 u | 0.85% |
| atomic number | 19 | 0.85% |
| atomic radius | 275 picometers (van der Waals radius) | 0.85% |
| boiling point | 1032 K or 759 °C or 1398 °F | 0.85% |
| cas number | 7440-09-7 | 0.85% |
| cas number of (cl2) | - | 99.15% |
| category | Alkali metals | 5.08% |
| crystal structure | BCC (Body-centered cubic) | 0.85% |
| density | 0.856 g/cm3 | 0.85% |
| electronegativity | 0.82 (Pauling scale) | 1.69% |
| electronic configuration | [Ar] 4s1 | 0.85% |
| electrons | 19 | 0.85% |
| electrons arrangement | 2, 8, 8, 1 | 0.85% |
| main isotopes | 39K | 0.85% |
| melting point | 336.7 K or 63.5 °C or 146.3 °F | 0.85% |
| neutrons | 20 | 1.69% |
| position | Group: 1, Period: 4, Block: s | 0.85% |
| rarity | ZERO-KELVIN | 33.33% |
| state | Solid | 72.88% |
| sublimation point | - | 99.15% |
| symbol | K | 0.85% |
| valence electrons | 1 | 5.93% |
| who discovered | Humphry Davy in 1807 | 0.85% |
Total Rarity Score: 2166.91
Rarity: #10/354