90
Th
Thorium
232.038062
2
8
18
32
18
10
2
8
18
32
18
10
2
| Property | Value |
|---|---|
| Atomic number | 90 |
| Atomic weight | 232.038062 amu |
| Element family | Actinoids |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Actinium |
| Next element | Protactinium |
| Density | 11.72 g/cm3 (STP) |
| Melting | 1755 °C |
| Boiling | 4787 °C |
| Covalent radius | 1.75 Å |
| Ionic radius | 0.972 Å |
| Metallic radius | 1.79 Å |
| First ionization potential | 6.084 eV |
| Electron affinity | 0.608 eV |
| Electronegativity | 1.3 |
| Discovery year | 1829 |
| Sample compounds |
|---|
| Th(SO4)2 |
Thorium is an element number 90 from actinoids family. Its symbol is Th. Thorium atomic weight is 232.038062 amu. Th has no stable or long lived isotopes. Thorium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s26d2. Sample compounds that contain Thorium are Th(SO4)2.
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