Rubidium (Rb) — Alkali metal. Atomic number 37.
Soft, silvery-white metal
- Atomic number: 37
- Symbol: Rb
- Atomic mass: 85.468 u
- Category: Alkali metal
- State: Solid
- Melting point: 39.35 °C / 312.5 K
- Boiling point: 687.85 °C / 961 K
- Density: 1.53 g/cm³ (20°C)
- Electron configuration: [Kr] 5s1
- Oxidation states: +1
- Electronegativity: 0.82
- Discovered by: Robert Bunsen and Gustav Kirchhoff (1861)
Common uses: Atomic clocks, Vacuum tubes, Research
Biological role: No known essential biological role.
Frequently Asked Questions about Rubidium
What is the atomic number of rubidium?
Rubidium has an atomic number of 37, meaning each atom contains 37 protons in its nucleus.
What is the atomic mass of rubidium?
The standard atomic weight of rubidium is 85.468 u (unified atomic mass units).
What category does rubidium belong to?
Rubidium is classified as a alkali metal.
What is the state of rubidium at room temperature?
Rubidium is a solid at 20 °C (68 °F).
What is the melting point of rubidium?
The melting point of rubidium is 39.35 °C / 312.5 K.
What is the boiling point of rubidium?
The boiling point of rubidium is 687.85 °C / 961 K.
What is the density of rubidium?
The density of rubidium is 1.53 g/cm³ (20°C).
What is the electronegativity of rubidium?
Rubidium has a Pauling electronegativity of 0.82.
What is the electron configuration of rubidium?
The electron configuration of rubidium is [Kr] 5s1.
What are the common oxidation states of rubidium?
Rubidium commonly exhibits the following oxidation states: +1.
When was rubidium discovered?
Rubidium was discovered in 1861 by Robert Bunsen and Gustav Kirchhoff.
Is rubidium radioactive?
Rubidium is a stable element with no naturally occurring radioactive isotopes.
What is the biological role of rubidium?
No known essential biological role.
What are the common uses of rubidium?
Rubidium is used for: Atomic clocks; Vacuum tubes; Research.
