Th
Thorium Symbol (Th)
Thorium is element 90 of the periodic table. Copy its symbol Th and see its atomic weight, electron configuration and physical properties.
What does Th mean?
Th is the chemical symbol for thorium, element number 90 in the periodic table. Thorium is an actinide in the f-block, period 7. It is a solid at room temperature and was discovered in 1828.
Codes and properties
| Chemical symbol | Th |
|---|---|
| Atomic number (Z) | 90 |
| Atomic weight (PubChem) | 232.038 |
| Group / period | f-block / 7 |
| Element category | actinide |
| Electron configuration | [Rn]7s² 6d² |
| State at 20 °C | Solid |
| Oxidation states | +4 |
| Electronegativity (Pauling) | 1.3 |
| Melting point | 2023 K (1749.85 °C) |
| Boiling point | 5061 K (4787.85 °C) |
| Density | 11.72 g/cm³ |
| Discovered | 1828 |
How to type Th
- Plain text: type
Th— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as H₂O — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Th}in math mode, or use the mhchem package:\ce{Th}. - HTML:
Th; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for thorium?
The chemical symbol for thorium is Th.
What is the atomic number of thorium?
Thorium has atomic number 90, meaning each atom has 90 protons.
What is the electron configuration of thorium?
The ground-state electron configuration of thorium is [Rn]7s² 6d².
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Reference: Thorium on PubChem (NIH)