37 Rb 85.468
Rubidium
alkali metal
Properties
- Atomic number
- 37
- Atomic mass
- 85.468 u
- Category
- alkali metal
- Group
- 1
- Period
- 5
- Block
- s-block
- State (room temp)
- Solid
- Outer-shell electrons
- 1
- Electronegativity
- 0.82 (Pauling)
- Density
- 1.532 g/cm³
- Melting point
- 39.3 °C
- Boiling point
- 687.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹
Noble-gas shorthand: [Kr] 5s¹
Electrons per shell: 2, 8, 18, 8, 1 — that's 1 in the outermost shell.
About Rubidium
Rubidium is a chemical element with symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, such as very rapid oxidation in air.
- Discovered by Robert Bunsen
- Appearance: grey white
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.