90
Th
Thorium
232.0381 | 2
8
18
32
18
10
2
|
90
Th
Thorium
232.0381 | 2
8
18
32
18
10
2
|
| General |
|---|
| Name | Thorium | | Symbol | Th | | Number | 90 | | Chemical series | Actinides | | Group / Period | 0 / 7 | | Block | f-block | | CAS registry number | 7440-29-1 |
| Physical properties |
|---|
| State | solid | | Density | 11.724 g/cm3 | | Melting point | 2115 K (1842 °C, 3348 °F) | | Boiling point | 5061 K (4788 °C, 8650 °F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | 232.0381 g/mol | | Crystal structure | cubic face centered | | Electronegativity | 1.30 | | Atomic radius | 180 pm | | Atomic radius (calculated) | | | Electron configuration | [Rn] 6d2 7s2 | | Electrons per shell | 2, 8, 18, 32, 18, 10, 2 | | Number of protons | 90 | | Number of neutrons | 142 |
|
Protactinium