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, which is 1 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
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
Rubidium: frequently asked questions
- What is Rubidium?
- Rubidium (Rb) is the chemical element with atomic number 37. It is a metal: specifically an alkali metal.
- What is the atomic number of Rubidium?
- Rubidium's atomic number is 37, which means every Rubidium atom has 37 protons in its nucleus.
- What is the electron configuration of Rubidium?
- The electron configuration of Rubidium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 (noble-gas shorthand: [Kr] 5s1). Its electrons are arranged in shells of 2, 8, 18, 8, 1, with 1 in the outermost shell.
- Is Rubidium a metal or a nonmetal?
- Rubidium is a metal: specifically an alkali metal.
- What group and period is Rubidium in?
- Rubidium is in group 1 and period 5 of the periodic table.
- Is Rubidium a solid, liquid, or gas?
- At room temperature, Rubidium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.