| Content-Type | image/png |
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| Content-Length | 5.41 kB |
| Size | 512x512 |
#20 Calcium - rarity ZERO-KELVIN
| 1st ionization energy | 6.113 eV | 0.85% |
|---|---|---|
| appearance | Dull silvery grey color | 0.85% |
| atomic mass | 40.078 u | 0.85% |
| atomic number | 20 | 0.85% |
| atomic radius | 231 picometers (van der Waals radius) | 0.85% |
| boiling point | 1757 K or 1484 °C or 2703 °F | 0.85% |
| cas number | 7440-70-2 | 0.85% |
| cas number of (cl2) | - | 99.15% |
| category | Alkaline earth metals | 5.08% |
| crystal structure | FCC (Face centered cubic) | 11.02% |
| density | 1.55 g/cm3 | 0.85% |
| electronegativity | 1.00 (Pauling scale) | 0.85% |
| electronic configuration | [Ar] 4s2 | 0.85% |
| electrons | 20 | 0.85% |
| electrons arrangement | 2, 8, 8, 2 | 0.85% |
| main isotopes | 40Ca | 0.85% |
| melting point | 1115 K or 842 °C or 1548 °F | 0.85% |
| neutrons | 20 | 1.69% |
| position | Group: 2, Period: 4, Block: s | 0.85% |
| rarity | ZERO-KELVIN | 33.33% |
| state | Solid | 72.88% |
| sublimation point | - | 99.15% |
| symbol | Ca | 0.85% |
| valence electrons | 2 | 7.63% |
| who discovered | Humphry Davy in 1808 | 0.85% |
Total Rarity Score: 2113.24
Rarity: #19/354