All chemical elements

Symbol

Rb

Atomic number

37

Chemical property

Alkali metal

Origin o the name

the Latin rubidus, 'deep red'

Group

1

Period

5

Atomic weight (u)

85.4678

Atomic weight uncertainty (u)

0.0003

Density (g/cm³)

1.532

Melting point (K)

312.46

Boiling point (K)

961

Heat capacity (J/(g·K))

0.363

Electro-negativity

0.82

Abundance in earth's crust (mg/kg)

90