89
Ac
Actinium
(227) | 2
8
18
32
18
9
2
|
89
Ac
Actinium
(227) | 2
8
18
32
18
9
2
|
| General |
|---|
| Name | Actinium | | Symbol | Ac | | Number | 89 | | Chemical series | Actinides | | Group / Period | 0 / 7 | | Block | f-block | | CAS registry number | 7440-34-8 |
| Physical properties |
|---|
| State | solid | | Density | 10.07 g/cm3 | | Melting point | 1323 K (1050 °C, 1922 °F) | | Boiling point | 3471 K (3198 °C, 5788 °F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | (227) g/mol | | Crystal structure | cubic face centered | | Electronegativity | 1.10 | | Atomic radius | 195 pm | | Atomic radius (calculated) | | | Electron configuration | [Rn] 6d1 7s2 | | Electrons per shell | 2, 8, 18, 32, 18, 9, 2 | | Number of protons | 89 | | Number of neutrons | 138 |
|
Thorium