Actinium 6. October 2015elementadmin ◄ Ra Tl ▲ ▼ Ac Th ► 89 Ac actinium (227) 89 Ac 3 Ac litho Actinium ∙ actinium ∙ attinio ∙ actinio group III: R2O3 melting point: 1050°C boiling point: 3200°C (±300°C) density: 10.07 g/cm³
