| Content-Type | image/png |
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| Content-Length | 2.15 kB |
| Size | 512x512 |
#93 Neptunium - rarity BROWNIAN-MANIACS
| 1st ionization energy | 6.266 eV | 0.85% |
|---|---|---|
| appearance | Silvery metallic appearance | 1.69% |
| atomic mass | 237 u | 0.85% |
| atomic number | 93 | 0.85% |
| atomic radius | 221 picometers (van der Waals radius) | 2.54% |
| cas number | 7439-99-8 | 0.85% |
| category | Inner transition metals | 23.73% |
| crystal structure | Orthorhombic | 6.78% |
| density | 20.45 g/cm3 | 0.85% |
| electronegativity | 1.36 (Pauling scale) | 1.69% |
| electronic configuration | [Rn] 5f4 6d1 7s2 | 0.85% |
| electrons | 93 | 0.85% |
| electrons arrangement | 2, 8, 18, 32, 22, 9, 2 | 0.85% |
| main isotopes | 237Np | 0.85% |
| neutrons | 144 | 0.85% |
| position | Group: actinides, Period: 7, Block: f | 1.69% |
| rarity | BROWNIAN-MANIACS | 33.33% |
| state | Solid | 72.88% |
| symbol | Np | 0.85% |
| who discovered | Edwin McMillan and Philip Abelson (in 1940) | 0.85% |
Total Rarity Score: 1655.67
Rarity: #91/354