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Relative atomic mass (227) Atomic mass (kg) 378x10-27 Density (g/cm3) 10.1 Physical State at STP Solid Melting point (°C) 1050 Boiling point (°C) 3200 Crystal Structure of solid element Face centred cubic Radioactive isotopes (4) 227Ac Half life 21.8 years

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