Rubidium 3. October 2015elementadmin ◄ Kr Cu ▲ ▼ Ag Sr ► 37 Rb rubidium 85.47 37 Rb 1 Rb litho Rubidium ∙ rubidium ∙ rubidio ∙ rubidio group I: R2O melting point: 38.89°C boiling point: 686°C density: 1.53 g/cm³
