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• Element Identification Timeline

Relative atomic mass (222) Atomic mass (kg) 370x10-27 Density (g/cm3) 4.4 Physical State at STP Monatomic gas (Rn) Melting point (°C) - 71 Boiling point (°C) - 61.8 Crystal Structure of solid element Face centred cubic Radioactive isotopes (7) 222Rn Half life 3.82 days

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