Ra

RADIUM

Definition from 'radius' or ray. upon exposure to air, it oxidizes immidiately.

Discovery 1898 by pierre of france

Uses radiation source, self luminous paints

Group of Elements Alkaline earth metals(Solid)

Atomic Weight (226)

Oxidation State +2

Melting Point 700

Boiling Point 1140

Density 5 g/cm3

Electronegativity 0.9