Elements / 20
20Ca40.078
Calcium
Alkaline earth metal · s-block · ring N · spoke 2
Calcium is element 20, an alkaline earth metal. It sits on ring N (period 4) on spoke 2, the alkaline earth metals. Follow that spoke toward the center and out again to find its chemical relatives.
Properties
| Density | 1.55 g/cm³ | Terrain → |
|---|---|---|
| Melting point | 1,115 K · 842 °C | Terrain → |
| Boiling point | 1,757 K · 1,484 °C | Terrain → |
| Electronegativity | 1.00 | Terrain → |
| First ionization energy | 590 kJ/mol | Terrain → |
| Atomic weight | 40.0784 u | Terrain → |
| Crustal abundance | 41,500 ppm5th most abundant in Earth's crust of 92 | Terrain → |
| Discovered | 1739 | Terrain → |
Values from open reference data; see sources. "Terrain" opens that property as a 3D landscape across the whole spiral.
Two things you might not know
- Davy isolated it in 1808 by electrolysing its oxide with mercury oxide on a platinum plate, then distilling off the mercury.
- Named from the Latin for lime; the most abundant metal in your body, it builds bone and is found in chalk, marble and limestone.
Checked against en.wikipedia.org.
Spoke 2: Alkaline earth metals
Ring N (period 4)
Play with Calcium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.