Elements / 77
77Ir192.22
Iridium
Transition metal · d-block · ring P · spoke 9
Iridium is element 77, a transition metal. It sits on ring P (period 6) on spoke 9. Follow that spoke toward the center and out again to find its chemical relatives.
Properties
| Density | 22.6 g/cm³2nd densest of 99 | Terrain → |
|---|---|---|
| Melting point | 2,719 K · 2,446 °C7th highest melting point of 97 | Terrain → |
| Boiling point | 4,403 K · 4,130 °C | Terrain → |
| Electronegativity | 2.20 | Terrain → |
| First ionization energy | 880 kJ/mol | Terrain → |
| Atomic weight | 192.217 u | Terrain → |
| Crustal abundance | 0.001 ppm | Terrain → |
| Discovered | 1803 | 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
- A thin stratum of clay rich in it marks the boundary layer behind the asteroid theory of the dinosaurs' extinction.
- Named for the Greek word for rainbow, after its colorful compounds; it made up 10 percent of the 1889 kilogram prototype.
Checked against en.wikipedia.org.
Spoke 9
Ring P (period 6)
Play with Iridium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.