Symbol
Th
Atomic Number
90
Atomic Mass
232.03805
Protons
90
Neutrons
142
Electrons
90
Type
Actinide
Isotopes
Thorium-232
Discovery Year
1828
Discovered By
Jöns Jacob Berzelius
Group
3
Period
7
Boiling Point
4820°F
Melting Point
3380°F
Electron Configuration
[Rn] 7s² 6d²
Density (g/cm³)
11.72
Crystal Structure
Hexagonal
Magnetism
Paramagnetic
Abundance in Earth's Crust
0.0006%
Phase at Room Temperature
Solid