Elements / 59
59Pr140.91
Praseodymium
Lanthanide · f-block · ring P
Praseodymium is element 59, a lanthanide. It is one of the lanthanides, which the spiral keeps in line on ring P instead of exiling them to a strip below the table.
Properties
| Density | 6.77 g/cm³ | Terrain → |
|---|---|---|
| Melting point | 1,208 K · 935 °C | Terrain → |
| Boiling point | 3,403 K · 3,130 °C | Terrain → |
| Electronegativity | 1.13 | Terrain → |
| First ionization energy | 527 kJ/mol | Terrain → |
| Atomic weight | 140.908 u | Terrain → |
| Crustal abundance | 9.2 ppm | Terrain → |
| Discovered | 1885 | 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
- Silicate crystals doped with its ions have slowed a pulse of light to only several hundred metres per second.
- Its name means leek-green twin; it tints glass and ceramics yellow and goes into the goggles of welders and glassblowers.
Checked against en.wikipedia.org.
Lanthanides
- La Lanthanum
- Ce Cerium
- Pr Praseodymium
- Nd Neodymium
- Pm Promethium
- Sm Samarium
- Eu Europium
- Gd Gadolinium
- Tb Terbium
- Dy Dysprosium
- Ho Holmium
- Er Erbium
- Tm Thulium
- Yb Ytterbium
Ring P (period 6)
Play with Praseodymium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.