81
Tl
Thallium
204.3833 | 2
8
18
32
18
3
|
81
Tl
Thallium
204.3833 | 2
8
18
32
18
3
|
| General |
|---|
| Name | Thallium | | Symbol | Tl | | Number | 81 | | Chemical series | Other metals | | Group / Period | 13 / 6 | | Block | p-block | | CAS registry number | 7440-28-0 |
| Physical properties |
|---|
| State | solid | | Density | 11.85 g/cm3 | | Melting point | 577 K (304 °C, 579 °F | | Boiling point | 1746 K (1473 °C, 2683 °F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | 204.3833 g/mol | | Crystal structure | hexagonal | | Electronegativity | 1.62 | | Atomic radius | 190 pm | | Atomic radius (calculated) | 156 pm | | Electron configuration | [Xe] 4f14 5d10 6s2 6p1 | | Electrons per shell | 2, 8, 18, 32, 18, 3 | | Number of protons | 81 | | Number of neutrons | 123 |
|
Lead