37
Rb
Rubidium
Rubidium
Rubidium (Rb)
Alkali Metals · Solid · Period 5 · Group 1
Element Properties
- Atomic Number
- 37
- Symbol
- Rb
- Atomic Mass
- 85.468
- Category
- Alkali Metals
- Standard State
- Solid
- Period
- 5
- Group
- 1
- Electronegativity
- 0.82
- Atomic Radius
- 303
- Ionization Energy
- 4.18
- Electron Affinity
- 0.47
- Oxidation States
- +1
- Melting Point
- 312.46 K (39.31 °C)
- Boiling Point
- 961 K (687.85 °C)
- Density
- 1.53
- Electron Configuration
- [Kr]5s1
- Year Discovered
- 1861
Electron shells
[Kr]5s1
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Rubidium?
The atomic number of Rubidium is 37, which equals the number of protons in its nucleus.
What is the atomic mass of Rubidium?
The atomic mass of Rubidium is approximately 85.468 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Rubidium?
The electron configuration of Rubidium is [Kr]5s1.
Where is Rubidium in the periodic table?
Rubidium is located in period 5, group 1.
When was Rubidium discovered?
Rubidium was discovered in 1861.
Related elements
Same group
1
H
Hydrogen
1.008
3
Li
Lithium
7
11
Na
Sodium
22.99
19
K
Potassium
39.098
55
Cs
Cesium
132.905
87
Fr
Francium
223.02