90
Th
Thorium
Thorium
Thorium (Th)
Actinides · Solid · Period 7 · Group 3
Element Properties
- Atomic Number
- 90
- Symbol
- Th
- Atomic Mass
- 232.038
- Category
- Actinides
- Standard State
- Solid
- Period
- 7
- Group
- 3
- Electronegativity
- 1.3
- Atomic Radius
- 237
- Ionization Energy
- 6.08
- Electron Affinity
- —
- Oxidation States
- +4
- Melting Point
- 2023 K (1749.85 °C)
- Boiling Point
- 5061 K (4787.85 °C)
- Density
- 11.72
- Electron Configuration
- [Rn]7s2 6d2
- Year Discovered
- 1828
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Frequently asked questions
What is the atomic number of Thorium?
The atomic number of Thorium is 90, which equals the number of protons in its nucleus.
What is the atomic mass of Thorium?
The atomic mass of Thorium is approximately 232.038 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Thorium?
The electron configuration of Thorium is [Rn]7s2 6d2.
Where is Thorium in the periodic table?
Thorium is located in period 7, group 3.
When was Thorium discovered?
Thorium was discovered in 1828.
Related elements
Same group
21
Sc
Scandium
44.956
39
Y
Yttrium
88.906
57
La
Lanthanum
138.905
58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.908
60
Nd
Neodymium
144.24