37 Rb
Alkali metal
Rubidium
Used in atomic clocks.
Properties of Rubidium
- Atomic number (Z)
- 37
- Symbol
- Rb
- Atomic mass
- 85.468 g/mol
- Category
- Alkali metal
- Group
- 1
- Period
- 5
- Electron configuration
- [Kr] 5s¹
- Electronegativity (Pauling)
- 0.82
- Atomic radius
- 265 pm
- First ionization energy
- 403 kJ/mol
- Melting point
- 312.46 K (39.3 °C)
- Boiling point
- 961 K (687.9 °C)
- Density
- 1.532 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1861
Frequently asked questions
What is Rubidium?
Rubidium (Rb) is an alkali metal, element number 37 on the periodic table. Used in atomic clocks.
What is the atomic number and atomic mass of Rubidium?
Rubidium has atomic number 37 and an atomic mass of about 85.468 g/mol.
What is the electron configuration of Rubidium?
The electron configuration of Rubidium is [Kr] 5s¹.
Where is Rubidium on the periodic table?
Rubidium sits in group 1, period 5, and is classified as a alkali metal.