Elements / 90
90Th232.04
Thorium
Actinide · f-block · ring Q
Thorium is element 90, an actinide. It is one of the actinides, which the spiral keeps in line on ring Q instead of exiling them to a strip below the table.
Properties
| Density | 11.7 g/cm³ | Terrain → |
|---|---|---|
| Melting point | 2,023 K · 1,750 °C | Terrain → |
| Boiling point | 5,061 K · 4,788 °C5th highest boiling point of 96 | Terrain → |
| Electronegativity | 1.30 | Terrain → |
| First ionization energy | 587 kJ/mol | Terrain → |
| Atomic weight | 232.038 u | Terrain → |
| Crustal abundance | 9.6 ppm | Terrain → |
| Discovered | 1829 | 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
- Its discoverer first used this name in 1817 for a false element that proved to be mostly yttrium orthophosphate.
- Named after the Norse god of thunder; over three times as abundant as uranium and first used in the gas mantle of 1885.
Checked against en.wikipedia.org.
Actinides
- Ac Actinium
- Th Thorium
- Pa Protactinium
- U Uranium
- Np Neptunium
- Pu Plutonium
- Am Americium
- Cm Curium
- Bk Berkelium
- Cf Californium
- Es Einsteinium
- Fm Fermium
- Md Mendelevium
- No Nobelium
Ring Q (period 7)
Play with Thorium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.