Thorium (Th) VS Uranium (U)
A definitive side-by-side comparison of two essential element profiles.
VS
Main Differences
Thorium (Th) is an element in the actinoids category with an atomic number of 90. Uranium (U) is an element in the actinoids category with an atomic number of 92.
Uranium (U) is 1.6x denser than Thorium (Th). Furthermore, Thorium (Th) melts at a significantly higher temperature than Uranium (U) (a difference of 709.7 Kelvin).
Where do the names come from?
Th Thorium (Th) Naming History
Thorium is named after Thor, the Scandinavian god of war.
U Uranium (U) Naming History
Uranium was named after the planet Uranus.
Related Comparisons
Compare
Thorium (Th)
Uranium (U)
Category
Actinoids
Actinoids
Atomic Number
90
92
Symbol
Th
U
Atomic Mass
232.038 u
238.029 u
Group
Actinides
Actinides
Period
7
7
Block
f-block
f-block
Standard State (at 20°C)
solid
solid
Density
11.72 g/cm³
19.1 g/cm³
Melting Point (°C)
1750°C
1135°C
Melting Point (°F)
3182°F
2075°F
Melting Point (K)
2115 K
1405.3 K
Boiling Point (°C)
4785°C
4131°C
Boiling Point (°F)
8645°F
7468°F
Boiling Point (K)
5061 K
4404 K
Year Discovered:
1828
1789
CAS Number
7440-29-1
7440-61-1
Origin of Name:
Thorium is named after Thor, the Scandinavian god of war.
Uranium was named after the planet Uranus.