Atomic Properties
- Atomic Number
- 37
- Atomic Mass
- 85.4680 u
- Electron Configuration
- [Kr] 5s1
- Electronegativity
- 0.82
- Block
- s-block
- Group
- 1
- Period
- 5
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 312.45 K
- Boiling Point
- 961.00 K
- Density
- 1.5320 g/cm³
About Rubidium
Soft alkali metal; used in atomic clocks and specialized glass.
Isotopes of Rubidium
Rubidium has 2 naturally occurring isotopes.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 85Rb | 85 | 84.91178974 | 72.17% | Stable |
| 87Rb | 87 | 86.90918053 | 27.83% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)