◄ Fr   Hg ▲   ▼ Ra   Ac ►

Radium ∙ radium ∙ radio ∙ radio
group II: RO

• melting point: 700°C
• boiling point: 1140°C
• density: 5 g/cm³

☢ radioisotopes: Ra-226 (T1/2=1600 a) NORM
Ra-223 (T1/2=11 d) medical