All chemical elements

Symbol

Cs

Atomic number

55

Chemical property

Alkali metal

Origin o the name

the Latin caesius, 'sky blue'

Group

1

Period

6

Atomic weight (u)

132.905452

Atomic weight uncertainty (u)

0

Density (g/cm³)

1.873

Melting point (K)

301.59

Boiling point (K)

944

Heat capacity (J/(g·K))

0.242

Electro-negativity

0.79

Abundance in earth's crust (mg/kg)

3