37
Rb
Rubidium
85.4678 | 2
8
18
8
1
|
37
Rb
Rubidium
85.4678 | 2
8
18
8
1
|
| General |
|---|
| Name | Rubidium | | Symbol | Rb | | Number | 37 | | Chemical series | Alkali metals | | Group / Period | 1 / 5 | | Block | s-block | | CAS registry number | 7440-17-7 |
| Physical properties |
|---|
| State | solid | | Density | 1.532 g/cm3 | | Melting point | 312.46 K (39.31°C, 102.76°F) | | Boiling point | 961 K (688°C, 1270°F) | | Critical point | 2093 K, 16 MPa |
| Atomic properties |
|---|
| Atomic Weight | 85.4678 g/mol | | Crystal structure | cubic body centered | | Electronegativity | 0.82 | | Atomic radius | 235 pm | | Atomic radius (calculated) | 265 pm | | Electron configuration | [Kr] 5s1 | | Electrons per shell | 2, 8, 18, 8, 1 | | Number of protons | 37 | | Number of neutrons | 48 |
|
Strontium