All chemical elements

Symbol

Ra

Atomic number

88

Chemical property

Alkaline earth metal

Origin o the name

the Latin radius, 'ray'

Group

2

Period

7

Density (g/cm³)

5.5

Melting point (K)

973

Boiling point (K)

2010

Heat capacity (J/(g·K))

0.094

Electro-negativity

0.9

Abundance in earth's crust (mg/kg)

0.000001