Elements / 65
65Tb158.93
Terbium
Lanthanide · f-block · ring P
Terbium is element 65, 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 | 8.23 g/cm³ | Terrain → |
|---|---|---|
| Melting point | 1,629 K · 1,356 °C | Terrain → |
| Boiling point | 3,396 K · 3,123 °C | Terrain → |
| Electronegativity | 1.10 | Terrain → |
| First ionization energy | 566 kJ/mol | Terrain → |
| Atomic weight | 158.925 u | Terrain → |
| Crustal abundance | 1.2 ppm | Terrain → |
| Discovered | 1843 | 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
- By 1877 chemists had mixed up its oxide with a sister oxide and reversed their names, a swap that stuck.
- Found by Mosander in 1843 and named for a Swedish village; its oxide may activate green phosphors in TV tubes.
Checked against education.jlab.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 Terbium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.