| Content-Type | image/png |
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| Content-Length | 8.64 kB |
| Size | 512x512 |
#88 Radium - rarity ZERO-KELVIN
| 1st ionization energy | 5.27 eV | 0.85% |
|---|---|---|
| appearance | Silvery-white metallic appearance | 2.54% |
| atomic mass | 226 u | 0.85% |
| atomic number | 88 | 0.85% |
| atomic radius | 238 picometers (van der Waals radius) | 0.85% |
| boiling point | 2010 K or 1737 °C or 3159 °F | 0.85% |
| cas number | 7440-14-4 | 0.85% |
| cas number of (cl2) | - | 99.15% |
| category | Alkaline earth metals | 5.08% |
| crystal structure | BCC (body centered cubic) | 5.93% |
| density | 5 g/cm3 | 0.85% |
| electronegativity | 0.9 (Pauling scale) | 0.85% |
| electronic configuration | [Rn] 7s2 | 0.85% |
| electrons | 88 | 0.85% |
| electrons arrangement | 2, 8, 18, 32, 18, 8, 2 | 0.85% |
| main isotopes | 226Ra | 0.85% |
| melting point | 973 K or 700 °C or 1292 °F | 0.85% |
| neutrons | 138 | 1.69% |
| position | Group: 2, Period: 7, Block: s | 0.85% |
| rarity | ZERO-KELVIN | 33.33% |
| state | Solid | 72.88% |
| sublimation point | - | 99.15% |
| symbol | Ra | 0.85% |
| valence electrons | 2 | 7.63% |
| who discovered | Pierre Curie and Marie Curie (in 1898) | 1.69% |
Total Rarity Score: 1983.36
Rarity: #49/354