| Content-Type | image/png |
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| Content-Length | 7.45 kB |
| Size | 512x512 |
#57 Lanthanum - rarity ZERO-KELVIN
| 1st ionization energy | 5.577 eV | 0.85% |
|---|---|---|
| appearance | Silvery white metallic | 5.08% |
| atomic mass | 138.91 u | 0.85% |
| atomic number | 57 | 0.85% |
| atomic radius | 240 picometers (van der Waals radius) | 1.69% |
| boiling point | 3737 K or 3464 °C or 6267 °F | 0.85% |
| cas number | 7439-91-0 | 0.85% |
| cas number of (cl2) | - | 99.15% |
| category | Lanthanides | 0.85% |
| crystal structure | Double hexagonal close packed | 5.08% |
| density | 6.15 g/cm3 | 0.85% |
| electronegativity | 1.1 (Pauling scale) | 1.69% |
| electronic configuration | [Xe] 5d1 6s2 | 0.85% |
| electrons | 57 | 0.85% |
| electrons arrangement | 2, 8, 18, 18, 9, 2 | 0.85% |
| main isotopes | 139La | 0.85% |
| melting point | 1193 K or 920 °C or 1688 °F | 0.85% |
| neutrons | 82 | 2.54% |
| position | Group: lanthanides, Period: 6, Block: d | 0.85% |
| rarity | ZERO-KELVIN | 33.33% |
| state | Solid | 72.88% |
| sublimation point | - | 99.15% |
| symbol | La | 0.85% |
| valence electrons | - | 61.02% |
| who discovered | Carl Gustaf Mosander in 1838 | 0.85% |
Total Rarity Score: 1974.69
Rarity: #50/354