| Content-Type | image/png |
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| Content-Length | 8.10 kB |
| Size | 512x512 |
#59 Praseodymium - rarity ZERO-KELVIN
| 1st ionization energy | 5.464 eV | 0.85% |
|---|---|---|
| appearance | Gray white metallic | 0.85% |
| atomic mass | 140.907 u | 0.85% |
| atomic number | 59 | 0.85% |
| atomic radius | 239 picometers (van der Waals radius) | 0.85% |
| boiling point | 3403 K or 3130 °C or 5666 °F | 0.85% |
| cas number | 7440-10-0 | 0.85% |
| cas number of (cl2) | - | 99.15% |
| category | Inner transition metals | 23.73% |
| crystal structure | Double hexagonal close packed | 5.08% |
| density | 6.64 g/cm3 | 0.85% |
| electronegativity | 1.13 (Pauling scale) | 0.85% |
| electronic configuration | [Xe] 4f3 6s2 | 0.85% |
| electrons | 59 | 0.85% |
| electrons arrangement | 2, 8, 18, 21, 8, 2 | 0.85% |
| main isotopes | 141Pr | 0.85% |
| melting point | 1208 K or 935 °C or 1715 °F | 0.85% |
| neutrons | 82 | 2.54% |
| position | Group: lanthanides, Period: 6, Block: f | 6.78% |
| rarity | ZERO-KELVIN | 33.33% |
| state | Solid | 72.88% |
| sublimation point | - | 99.15% |
| symbol | Pr | 0.85% |
| valence electrons | - | 61.02% |
| who discovered | Carl Auer von Welsbach in 1885 | 1.69% |
Total Rarity Score: 1914.99
Rarity: #66/354