Elements / 88
88Ra[226]
Radium
Alkaline earth metal · s-block · ring Q · spoke 2
Radium is element 88, an alkaline earth metal. It sits on ring Q (period 7) on spoke 2, the alkaline earth metals. Follow that spoke toward the center and out again to find its chemical relatives.
Properties
| Density | 5.5 g/cm³ | Terrain → |
|---|---|---|
| Melting point | 1,233 K · 960 °C | Terrain → |
| Boiling point | 2,010 K · 1,737 °C | Terrain → |
| Electronegativity | 0.90 | Terrain → |
| First ionization energy | 509 kJ/mol | Terrain → |
| Atomic weight | 226 u | Terrain → |
| Crustal abundance | 9.0 × 10⁻⁷ ppm | Terrain → |
| Discovered | 1898 | 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
- Once added to cosmetics, soap, razor blades and even drinks. A ton of pitchblende yields about a seventh of a gram.
- Found by Marie and Pierre Curie in 1898. Dial painters who licked their brushes to a point suffered sores, anemia and bone cancer.
Checked against en.wikipedia.org.
Spoke 2: Alkaline earth metals
Ring Q (period 7)
Play with Radium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.