Rubidium (Rb)

A fascinating alkali metal element.

Rubidium is element 37 on the periodic table.

Element properties

Atomic number

37

Symbol

Rb

Atomic mass

85.468 u

Category

Alkali Metal

Period

5

Group

1

Block

s

State

Solid

Electron configuration

[Kr] 5s1

Electronegativity (Pauling)

0.82

Density

1.532 g/cm³

Melting point

39.3 °C

Boiling point

688 °C