Radium (Ra)

A fascinating alkaline earth metal element.

Radium is element 88 on the periodic table.

Element properties

Atomic number

88

Symbol

Ra

Atomic mass

226 u

Category

Alkaline Earth Metal

Period

7

Group

2

Block

s

State

Solid

Electron configuration

[Rn] 7s2

Electronegativity (Pauling)

0.9

Density

5.5 g/cm³

Melting point

700 °C

Boiling point

1737 °C