90Th232.04
Thorium
ActinidesHeavy, radioactive metals. Most of them are made only in laboratories.
[Rn] 6d² 7s²
- Atomic number
- 90
- Atomic mass
- 232.04
- Protons
- 90
- Neutrons
- 142 (most common)
- Electrons
- 90
- Shells
- 2, 8, 18, 32, 18, 10, 2
- State at 25 °C
- Solid
- Position
- Period 7, f-block
Proton (+)Neutron (0)Electron (−)
Discovered byJöns Jacob Berzelius, 1829Jöns Jacob Berzelius: 4 elements
Named after Thor, the Norse god of thunder.
Did you know?
- India's three-stage nuclear power plan aims to use thorium as fuel.
- It is about three times more common than uranium.
Where it's found
- Monazite sands of Kerala and Odisha: India has some of the world's largest reserves
What it's used for
- Future nuclear fuel
- Formerly gas lantern mantles
Try it
There's no safe home experiment for Thorium. Explore it with the animated atom above instead.