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Relative atomic mass (226) Atomic mass (kg) 375x10-27 Density (g/cm3) 5.0 Physical State at STP Solid Melting point (°C) 700 Boiling point (°C) 1140 Crystal Structure of solid element Body centred cubic Radioactive isotopes (6) 226Ra Half life 1600 years

STP = standard temperature and pressure. Usually considered as room temperature and pressure.