37
Rb
Rubidium
Alkali metal period 5 group 1 s-block discovered: 1861
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 37
- Atomic mass
- 85.468 a.m.u.
- Electron configuration
- [Kr]5s1
- Electronegativity
- 0.82 on the Pauling scale
- Atomic radius
- 303 pm
- Ionization energy
- 4.177 eV
- Electron affinity
- 0.468 eV
- Oxidation states
- +1
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 312.46 K (39,31 °C)
- Boiling point
- 961 K (687,85 °C)
- Density
- 1.53 g/cm³