Elements / 69
69Tm168.93
Thulium
Lanthanide · f-block · ring P
Thulium is element 69, 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 | 9.32 g/cm³ | Terrain → |
|---|---|---|
| Melting point | 1,818 K · 1,545 °C | Terrain → |
| Boiling point | 2,223 K · 1,950 °C | Terrain → |
| Electronegativity | 1.25 | Terrain → |
| First ionization energy | 597 kJ/mol | Terrain → |
| Atomic weight | 168.934 u | Terrain → |
| Crustal abundance | 0.52 ppm | Terrain → |
| Discovered | 1879 | 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
- In 1911 Charles James reported that he needed 15,000 purification operations to show his sample was homogeneous.
- Named for an Ancient Greek place name tied to Scandinavia or Iceland; its isotopes power some portable X-ray devices.
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 Thulium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.